The Concord River is a 16.3-mile-long (26.2 km) tributary of the Merrimack River in eastern Massachusetts , United States. The river drains a small rural, suburban region northwest of Boston . As one of the most notable small rivers in U.S. history, it was the scene of an important early battle of the American Revolutionary War and was the subject of a 19th-century book by Henry David Thoreau .
59-876: The river begins in Middlesex County , formed by the confluence of the Sudbury and Assabet Rivers at Egg Rock , near the Concord town center. It flows generally north, from eastern Concord (along the northwestern edge of the Boston metropolitan area ), joining the Merrimack River from the south on the eastern side of Lowell . It is a gently flowing stream with little variation in topography along most of its route. Its drainage basin stretches into Worcester County and includes 36 towns within Massachusetts. Native Americans called it
118-738: A sanitary sewer or to a surface water in the environment. Some industrial facilities generate wastewater that can be treated in sewage treatment plants . Most industrial processes, such as petroleum refineries , chemical and petrochemical plants have their own specialized facilities to treat their wastewaters so that the pollutant concentrations in the treated wastewater comply with the regulations regarding disposal of wastewaters into sewers or into rivers, lakes or oceans . This applies to industries that generate wastewater with high concentrations of organic matter (e.g. oil and grease), toxic pollutants (e.g. heavy metals, volatile organic compounds ) or nutrients such as ammonia . Some industries install
177-487: A change in state law. Immediately prior to its dissolution, the executive branch consisted of three County Commissioners elected at-large to staggered four-year terms. There was a County Treasurer elected to a six-year term. The county derived its revenue primarily from document filing fees at the Registries of Deeds and from a Deeds Excise Tax; also a transfer tax was assessed on the sale price of real estate and collected by
236-694: A network of pipes and pump stations (called sewerage ) which convey the sewage to a treatment plant. For cities that have a combined sewer , the sewers will also carry urban runoff (stormwater) to the sewage treatment plant. Sewage treatment often involves two main stages, called primary and secondary treatment , while advanced treatment also incorporates a tertiary treatment stage with polishing processes and nutrient removal. Secondary treatment can reduce organic matter (measured as biological oxygen demand ) from sewage, using aerobic or anaerobic biological processes. A so-called quarternary treatment step (sometimes referred to as advanced treatment) can also be added for
295-574: A part of the Middlesex County government, was also relatedly forced to relocate to Medford at the time of the closure of the Superior Courthouse building in Cambridge. Of the fourteen counties of Massachusetts, Middlesex is one of eight which have had no county government or county commissioners since July 1, 1998, when county functions were assumed by state agencies at local option following
354-471: A pre-treatment system to remove some pollutants (e.g., toxic compounds), and then discharge the partially treated wastewater to the municipal sewer system. Agricultural wastewater treatment is a farm management agenda for controlling pollution from confined animal operations and from surface runoff that may be contaminated by chemicals in fertilizer , pesticides , animal slurry , crop residues or irrigation water. Agricultural wastewater treatment
413-574: A result, three wastewater treatment plants were constructed along the banks of the Concord River: one in Concord and two in Billerica . These facilities played a crucial role in preventing further degradation of the river ecosystem by operating within federally mandated limits. Pollutants such as heavy metals and PCBs continue to be trapped in the sediment of the Sudbury River and downstream into
472-426: A separate Industrial wastewater treatment , or in a sewage treatment plant. In the latter case it usually follows pre-treatment. Further types of wastewater treatment plants include Agricultural wastewater treatment and leachate treatment plants. One common process in wastewater treatment is phase separation , such as sedimentation. Biological and chemical processes such as oxidation are another example. Polishing
531-504: A treatment sequence to remove solids generated during oxidation or polishing. Grease and oil may be recovered for fuel or saponification . Solids often require dewatering of sludge in a wastewater treatment plant . Disposal options for dried solids vary with the type and concentration of impurities removed from water. Solids such as stones , grit, and sand may be removed from wastewater by gravity when density differences are sufficient to overcome dispersion by turbulence . This
590-571: Is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges. Sewage contains wastewater from households and businesses and possibly pre-treated industrial wastewater . There are a high number of sewage treatment processes to choose from. These can range from decentralized systems (including on-site treatment systems) to large centralized systems involving
649-435: Is also an example. The main by-product from wastewater treatment plants is a type of sludge that is usually treated in the same or another wastewater treatment plant. Biogas can be another by-product if the process uses anaerobic treatment. Treated wastewater can be reused as reclaimed water . The main purpose of wastewater treatment is for the treated wastewater to be able to be disposed or reused safely. However, before it
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#1732845422818708-613: Is just one of many blockages that caused the alewife population to collapse on the Concord River. Water was later diverted north to Lowell and south to Charlestown to run the Middlesex Canal . During the 19th century, the Concord River was a hub of industrial activity during the US Industrial Revolution . This led to environmental challenges as industrial wastes, untreated sewage , and other organic waste were dumped into
767-516: Is land and 29 square miles (75 km ) (3.5%) is water. It is the third-largest county in Massachusetts by land area. It is bounded southeast by the Charles River and drained by the Merrimack , Nashua , and Concord rivers, and other streams. The MetroWest region comprises much of the southern portion of the county. These routes pass through Middlesex County As of 2006 , Middlesex County
826-770: Is oversight of the Middlesex House of Correction and Jail in Billerica . It formerly ran the Middlesex Jail in Cambridge , which closed on June 28, 2014. In addition, the Sheriff's Office operates the Office of Civil Process and, the Lowell Community Counseling Centers, and crime prevention and community service programs. The office of sheriff was created in 1692, making it one of the oldest law enforcement agencies in
885-567: Is preserved by the National Park Service . Henry David Thoreau wrote his first book, A Week on the Concord and Merrimack Rivers , in 1849 while living at nearby Walden Pond . His book recounted a seven-day boat trip on the rivers with his brother John, who had since died. Thoreau recounted his exploration of the natural beauty of the river, and his accompanying thoughts on such eternal themes as truth, poetry, travel and friendship. Despite
944-1206: Is required for continuous confined animal operations like milk and egg production. It may be performed in plants using mechanized treatment units similar to those used for industrial wastewater . Where land is available for ponds, settling basins and facultative lagoons may have lower operational costs for seasonal use conditions from breeding or harvest cycles. Animal slurries are usually treated by containment in anaerobic lagoons before disposal by spray or trickle application to grassland. Constructed wetlands are sometimes used to facilitate treatment of animal wastes. Leachate treatment plants are used to treat leachate from landfills . Treatment options include: biological treatment, mechanical treatment by ultrafiltration , treatment with active carbon filters, electrochemical treatment including electrocoagulation by various proprietary technologies and reverse osmosis membrane filtration using disc tube module technology. The unit processes involved in wastewater treatment include physical processes such as settlement or flotation and biological processes such oxidation or anaerobic treatment. Some wastewaters require specialized treatment methods. At
1003-636: Is treated, the options for disposal or reuse must be considered so the correct treatment process is used on the wastewater. The term "wastewater treatment" is often used to mean " sewage treatment ". Wastewater treatment plants may be distinguished by the type of wastewater to be treated. There are numerous processes that can be used to treat wastewater depending on the type and extent of contamination. The treatment steps include physical, chemical and biological treatment processes. Types of wastewater treatment plants include: Sewage treatment (or domestic wastewater treatment , municipal wastewater treatment )
1062-475: Is typically achieved using a grit channel designed to produce an optimum flow rate that allows grit to settle and other less-dense solids to be carried forward to the next treatment stage. Gravity separation of solids is the primary treatment of sewage , where the unit process is called "primary settling tanks" or "primary sedimentation tanks". It is also widely used for the treatment of other types of wastewater. Solids that are denser than water will accumulate at
1121-411: Is widely used for disinfection. Advanced oxidation processes are used to remove some persistent organic pollutants and concentrations remaining after biochemical oxidation. Disinfection by chemical oxidation kills bacteria and microbial pathogens by adding hydroxyl radicals such as ozone , chlorine or hypochlorite to wastewater. These hydroxyl radical then break down complex compounds in
1180-614: The Commonwealth of Massachusetts , United States. As of the 2020 census , the population was 1,632,002, making it the most populous county in both Massachusetts and New England and the 22nd most populous county in the United States . This also makes the county the most populous county on the East Coast outside of New York or Florida. Middlesex County is one of two U.S. counties (along with Santa Clara County, California ) to be amongst
1239-531: The Musketaquid or "grass-grown" river because its sluggish waters abound in aquatic or semi-aquatic vegetation and its banks are fringed with wild grasses and sedges which stretch for miles along both sides of this placid stream. This creates an ideal environment for a variety of fish, including bass , shad , alewife (river herring), pickerel , carp and American eel . Native Americans wove sticks in intricate designs to trap alewives and other migrating fish at
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#17328454228181298-522: The Superior Courthouse , one of which was formerly in Cambridge (since 2008 relocated to Woburn.) and one in Lowell; and the defunct Middlesex County Hospital in the city of Waltham. The legislation abolishing the Middlesex County executive retained the Sheriff and Registers of Deeds as independently elected officials, and transferred the Sheriff's Office under the state Department of Public Safety and
1357-636: The geographic center of Massachusetts, which is in Rutland , Worcester County ). On July 11, 1997, Massachusetts abolished the executive government of Middlesex County primarily due to the county's insolvency . Middlesex County continues to exist as a geographic boundary and is used primarily as district jurisdictions within the court system and for other administrative purposes; for example, as an election district. The National Weather Service weather alerts (such as severe thunderstorm warning ) continue to localize based on Massachusetts's counties. The county
1416-668: The Boston Pops, throughout the British Isles and Western Europe, and at the Edinburgh Military Tattoo's Salute to Australia in Sydney, Australia. Wastewater treatment plants Wastewater treatment is a process which removes and eliminates contaminants from wastewater . It thus converts it into an effluent that can be returned to the water cycle . Once back in the water cycle, the effluent creates an acceptable impact on
1475-467: The Concord River. As a result, fish consumption is prohibited in such areas, due to the presence of mercury-laden sediment originating from the Nyanza Superfund site and other sources. In August 2004, perchlorate was detected in the Concord River. Initially, it was believed that explosives used in nearby road and building construction may have caused this contamination. However, an investigation by
1534-467: The Concord as their new home river. The experiment did not succeed, as too few fish returned to the base of the first dam on the Concord River. A feasibility study published in 2016 is again exploring steps necessary for returning diadromous fish to the Concord River, and farther upstream, to the Sudbury and Assabet Rivers. Middlesex County, Massachusetts Middlesex County is a county located in
1593-597: The Northern District at Lowell and another for the Southern District at Cambridge) are each elected to serve six-year terms. Besides the employees of the Sheriff's Office and the two Registries of Deeds, the county had a Maintenance Department, a Security Department, some administrative staff in the Treasurer's and Commissioners' Offices, and the employees of the hospital. The county government also owned and operated
1652-484: The Registries of Deeds. Budgets as proposed by the County Commissioners were approved by a County Advisory Board that consisted of a single representative of each of the 54 cities and towns in Middlesex County. The votes of the individual members of the advisory board were weighted based on the overall valuation of property in their respective communities. The County Sheriff and two Registers of Deeds (one for
1711-417: The United States. The sheriff is elected to a 6-year term. Notable sheriffs include: Prior to 1960, Middlesex County was a Republican Party stronghold, backing only two Democratic Party presidential candidates from 1876 to 1956. The 1960 election started a reverse trend, with the county becoming a Democratic stronghold. This has been even more apparent in recent years, with George H. W. Bush in 1988 being
1770-626: The bottom of quiescent settling basins . More complex clarifiers also have skimmers to simultaneously remove floating grease such as soap scum and solids such as feathers, wood chips, or condoms . Containers like the API oil-water separator are specifically designed to separate non-polar liquids. Oxidation reduces the biochemical oxygen demand of wastewater, and may reduce the toxicity of some impurities. Secondary treatment converts organic compounds into carbon dioxide , water , and biosolids through oxidation and reduction reactions. Chemical oxidation
1829-589: The cities and towns in which they are located. School districts include: K-12: Secondary: Elementary: Tertiary institutions include: Middlesex County is home to the Middlesex County Volunteers , a fife and drum corps that plays music from the 17th, 18th, 19th and 20th centuries. Founded in 1982 at the end of the United States Bicentennial celebration, the group performs extensively throughout New England. They have also performed at
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1888-549: The county was 80.0% white, 9.3% Asian, 4.7% black or African American, 0.2% American Indian, 3.3% from other races, and 2.5% from two or more races. Those of Hispanic or Latino origin made up 6.5% of the population. The largest ancestry groups were: Of the 580,688 households, 31.0% had children under the age of 18 living with them, 49.5% were married couples living together, 10.1% had a female householder with no husband present, 36.9% were non-families, and 27.8% of all households were made up of individuals. The average household size
1947-534: The dams prevented the mature fish from returning upstream to spawn. Alewife and other anadromous fish are migratory. They hatch in freshwater, make their way to the sea to mature, then return as adults to freshwater to spawn , usually near where they had hatched. This instinct is imprinted within the fish when it is born. When the route upstream became blocked, this cycle was broken and the fish were unable to survive without it. The Faulkner Dam in North Billerica
2006-406: The development of suburbs near the river, it remains a popular canoeing destination today. The last mile of the river in Lowell is serious class 3+/4 whitewater . Dams were built along the Concord River to increase crop production and also to provide a source of power for operating mills . As a result, by the 19th century, the native fish populations of shad and alewife became extinct because
2065-547: The dissolution of the executive county government, the county comprised two regions with separate county seats for administrative purposes: Since the start of the 21st century, much of the current and former county offices have physically decentralized from the Cambridge seat, with the sole exceptions being the Registry of Deeds and the Middlesex Probate and Family Court, which both retain locations in Cambridge and Lowell. Since
2124-476: The environment. It is also possible to reuse it. This process is called water reclamation . The treatment process takes place in a wastewater treatment plant. There are several kinds of wastewater which are treated at the appropriate type of wastewater treatment plant. For domestic wastewater the treatment plant is called a Sewage Treatment . Municipal wastewater or sewage are other names for domestic wastewater . For industrial wastewater, treatment takes place in
2183-650: The first quarter of 2008, the Superior Courthouse has been seated in the city of Woburn ; the Sheriff's Office is now administratively seated in the city of Medford and the Cambridge-based County Jail has since been amalgamated with another county jail facility in Billerica. The Cambridge District Court (which has jurisdiction for Arlington, Belmont and Cambridge); along with the Middlesex County District Attorney's Office, although not
2242-540: The governmental functions such as property tax assessment and collection, public education, road repair and maintenance, and elections were all conducted at the municipal city and town level and not by the county government. In 2012 the 22-story Superior Court Building in Cambridge which was transferred from the abolished Executive County government was sold by the Commonwealth of Massachusetts. Due to its transfer from state control, many local residents had tried to force
2301-461: The largest Irish-American population of any U.S. county with a plurality of Irish ancestry. The ranking of unincorporated communities that are included on the list is reflective if the census-designated locations and villages were included as cities or towns. Data is from the 2007-2011 American Community Survey 5-Year Estimates. The primary responsibility of the Middlesex Sheriff's Office
2360-566: The last Republican presidential candidate to manage forty percent of the county's votes and Mitt Romney in 2012 being the last Republican presidential candidate to manage even thirty percent of the vote. In 2020, Joe Biden won 71% of the vote, the highest percent for any presidential candidate since 1964. Most municipalities in Middlesex County have a town form of government; the remainder are cities, and are so designated on this list. Villages listed below are census or postal divisions but have no separate corporate or statutory existence from
2419-483: The main criteria for selection are: desired effluent quality, expected construction and operating costs, availability of land, energy requirements and sustainability aspects. In developing countries and in rural areas with low population densities, sewage is often treated by various on-site sanitation systems and not conveyed in sewers. These systems include septic tanks connected to drain fields , on-site sewage systems (OSS), vermifilter systems and many more. On
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2478-535: The mouths of rivers throughout this region. By 1635, settlers from England began to arrive, giving the river its current name. On April 19, 1775, the Old North Bridge over the river in the town of Concord was the scene of the famous Battle of Concord (occurring on the same day when the first shots of the Revolutionary War were fired at nearby Lexington ). The current version of the bridge (a reproduction)
2537-764: The organic pollutants into simple compounds such as water, carbon dioxide, and salts . Anaerobic wastewater treatment processes (for example UASB , EGSB ) are also widely applied in the treatment of industrial wastewaters and biological sludge. Polishing refers to treatments made in further advanced treatment steps after the above methods (also called "fourth stage" treatment). These treatments may also be used independently for some industrial wastewater. Chemical reduction or pH adjustment minimizes chemical reactivity of wastewater following chemical oxidation. Carbon filtering removes remaining contaminants and impurities by chemical absorption onto activated carbon . Filtration through sand (calcium carbonate) or fabric filters
2596-437: The other hand, advanced and relatively expensive sewage treatment plants may include tertiary treatment with disinfection and possibly even a fourth treatment stage to remove micropollutants. Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to
2655-520: The private developers to reduce the overall height of the structure. Even following the abolition of the executive branch for county government in Middlesex, communities are still granted a right by the Massachusetts state legislature to form their own regional compacts for sharing of services and costs thereof. According to the U.S. Census Bureau , the county has a total area of 847 square miles (2,190 km ), of which 818 square miles (2,120 km )
2714-456: The removal of organic micropollutants, such as pharmaceuticals. This has been implemented in full-scale for example in Sweden. A large number of sewage treatment technologies have been developed, mostly using biological treatment processes. Design engineers and decision makers need to take into account technical and economical criteria of each alternative when choosing a suitable technology. Often,
2773-605: The river, leading to harmful excessive growth of aquatic plants . In May 2000, the U.S. Fish and Wildlife Service , the Massachusetts Riverways Program, and volunteers from the Sudbury Valley Trustees (SVT) released 7,000 adult alewives into the Concord River. They were transferred from the Nemasket River so that they could lay their eggs and spawn upstream. This imprinted the young alewives with
2832-671: The river. Industrial development peaked in the 1920s, contributing to the pollution of the river. By the 1960s, the Merrimack River into which the Concord River empties, was considered one of the top 10 most polluted waterways in America. Following the passage of the Clean Water Act in 1972, the United States initiated efforts to enhance the quality of America's water bodies. This legislation imposed more stringent regulations on point source discharges into rivers and other navigable waters. As
2891-456: The simplest level, treatment of most wastewaters is carried out through separation of solids from liquids , usually by sedimentation . By progressively converting dissolved material into solids, usually a biological floc or biofilm , which is then settled out or separated, an effluent stream of increasing purity is produced. Phase separation transfers impurities into a non-aqueous phase . Phase separation may occur at intermediate points in
2950-459: The top 25 counties with the highest household income and the 25 most populated counties. It is included in the Census Bureau's Boston – Cambridge – Newton , MA– NH Metropolitan Statistical Area . As part of the 2020 United States census , the Commonwealth's mean center of population for that year was geo-centered in Middlesex County, in the town of Natick (this is not to be confused with
3009-496: The town of Billerica eventually determined that the source was a local company that produced surgical and medical materials. The company had been using 220 gallons of perchloric acid per month in a bleaching process, with the rinse water being discharged into the sewage system . Following this investigation, the company voluntarily ceased operations until it could install ion exchange equipment to comply with environmental regulations. In May 2007, Billerica faced legal action and
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#17328454228183068-595: The two Registries of Deeds. Besides the Sheriff and the two Registers of Deeds, the Middlesex District Attorney, the Middlesex Register of Probate and the Middlesex Clerk of Courts (which were already part of state government before the abolition of Middlesex County government) are all elected countywide to six-year terms. In Middlesex County (as in the entirety of the Commonwealth of Massachusetts),
3127-538: The two Registry of Deeds offices to the Massachusetts Secretary of State's Office. Additionally, all county maintenance and security employees were absorbed into the corresponding staffs of the Massachusetts Trial Court . The legislation also transferred ownership of the two Superior Courthouses to the Commonwealth of Massachusetts. The hospital was closed. Finally, the office of County Commissioner
3186-661: Was 2.49 and the average family size was 3.10. The median age was 38.5 years. The median income for a household in the county was $ 77,377 and the median income for a family was $ 97,382. Males had a median income of $ 64,722 versus $ 50,538 for females. The per capita income for the county was $ 40,139. About 5.1% of families and 7.6% of the population were below the poverty line , including 8.0% of those under age 18 and 8.0% of those age 65 or over. 79.6% spoke English , 4.3% Spanish , 2.7% Portuguese , 1.6% Italian , 1.6% Chinese including Mandarin and other Chinese dialects and 1.5% French as their first language. Middlesex County has
3245-480: Was created by the Massachusetts General Court on May 10, 1643, when it was ordered that "the whole plantation within this jurisdiction be divided into four shires. " Middlesex initially contained Charlestown , Cambridge , Watertown , Sudbury , Concord , Woburn , Medford , and Reading . In 1649 the first Middlesex County Registry of Deeds was created in Cambridge. On April 19, 1775, Middlesex
3304-694: Was fined $ 250,000 for releasing pollutants into the Concord River. This action was taken by the U.S. Environmental Protection Agency (EPA) and the Massachusetts Department of Environmental Protection (MassDEP) due to the town exceeding allowable effluent limits for phosphorus , fecal coliform bacteria , pH , and ammonia nitrogen. Additionally, the town was charged with failing to submit discharge monitoring reports, complying with monitoring requirements, and failing to submit infiltration and inflow reporting. The EPA stated that Billerica's phosphorus discharges resulted in an excess of nutrients released in
3363-424: Was immediately abolished and the office of County Treasurer was abolished as of December 31, 2002. Any county roads transferred to the Commonwealth as part of the dissolution. The other administrative duties (such as Sheriff, Department of Deeds and court system , etc.) and all supporting staff were transferred under the Commonwealth as well. Records of land ownership in Middlesex County continue to be maintained at
3422-403: Was tenth in the United States on the list of most millionaires per county. As of the 2010 United States Census , there were 1,503,085 people, 580,688 households, and 366,656 families residing in the county. The population density was 1,837.9 inhabitants per square mile (709.6/km ). There were 612,004 housing units at an average density of 748.3 per square mile (288.9/km ). The racial makeup of
3481-616: Was the site of the first armed conflict of the American Revolutionary War . In 1855, the Massachusetts State Legislature created a minor Registry of Deeds for the Northern District of Middlesex County in Lowell. In the late 19th century and early 20th century, Boston annexed several of its adjacent cities and towns including Charlestown and Brighton from Middlesex County, resulting in an enlargement and accretion toward Suffolk County . Beginning prior to
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