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Drinking Water Quality Report


Rehoboth District - Lincoln, DE


Serves 30,000 people - Test data available: 2004-2007

This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the Delaware Health and Social Services- Division of Public Health. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources to protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes test results for this utility and lists potential health concerns.

 
This Drinking Water System
National Average
Exceed Health GuidelinesTests showing chemicals at concentrations above health guidelines established by federal and state health agencies. These guidelines are typically set at a levels that pose no significant health risk.
10 chemicals
4
Health Standard ExceedencesChemicals detected at concentrations above the legal limit, the Maximum Contaminant Level (MCLs) established by the U.S. EPA. Most MCLs are based on annual averages, so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.
0 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
34 chemicals
8
Tests ConductedThe total number of number of water quality tests conducted by water utilities and recorded in data provided by the state water agency.
3,915tests
420

Contaminants Exceeding Health Guidelines

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
BromoformBromoform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.52 ppb
1.8 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
DibromochloromethaneDibromochloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.1.07 ppb
4.7 ppb
Yes
0.4 ppb
No
80 ppb
BromodichloromethaneBromodichloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.7 ppb
3.5 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
Total haloacetic acids (HAAs)Total haloacetic acids refers to the sum of the concentrations of five related disinfection byproducts in a water sample: dichloroacetic acid, trichloroacetic acid, monochloroacetic acid, monobromoacetic acid and dibromoacetic acid.1.08 ppb
3.7 ppb
Yes
0.7 ppb
No
60 ppb
Dichloroacetic acidDichloroacetic acid is a disinfection byproduct regulated by EPA as one of five haloacetic acids that are formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.46 ppb
1.5 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
60 ppb
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.2.93 ppb
12.2 ppb
Yes
9.8 ppb
No
80 ppb
PentachlorophenolPentachlorophenol is a carcinogenic pollutant discharged from wood preserving factories.<0.01 ppb
0.06 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
1 ppb
Di(2-ethylhexyl) phthalateDi(2-ethylhexyl) phthalate is a pollutant from rubber and industrial chemical factories and a leachate from PVC pipes; it is classified by EPA as a probable human carcinogen.0.05 ppb
0.84 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
6 ppb
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.0.15 ppb
1.1 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.0.14 pCi/L
0.19 pCi/L
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 pCi/L
No
15 pCi/L
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Other Detected Contaminants

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
NitrateNitrate enters drinking water sources from fertilizer runoff, leaching septic tanks, and erosion of natural deposits; it is also emitted by chemical, petrochemical and metal-finishing industries.3.52 ppm
5.3 ppm
No
10 ppm
No
10 ppm
ChloroformChloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.5 ppb
2.2 ppb
No
5.7 ppb
No
80 ppb
Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.2.71 ppm
5 ppm
No
10 ppm
No
10 ppm
Dibromoacetic acidDibromoacetic acid is a disinfection byproduct regulated by EPA as one of five haloacetic acids that are formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.55 ppb
1.73 ppb
NoNo
60 ppb
Barium (total)Barium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.66.01 ppb
102 ppb
No
700 ppb
No
2000 ppb
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.2.58 ppb
3.9 ppb
No
100 ppb
No
100 ppb
TolueneToluene is a pollutant from petroleum refineries and a chemical used in plastics manufacturing as well as the pharmaceutical, paint and furniture industries.0.76 ppb
14.5 ppb
No
150 ppb
No
1000 ppb
DiethylphthalateDiethylphthalate is an industrial solvent used in many consumer products, particularly those containing fragrances; it may be present in perfume, cologne, deodorant, soap, shampoo, hand lotion, and other personal care products.0.92 ppb
16.57 ppb
No
1700 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
PhenanthrenePhenanthrene is a pollutant from the incomplete combustion of fossil fuels, and is also used in the manufacture of dyes, explosives and pharmaceuticals.0.04 ppb
0.78 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
FluoreneFluorene is a polycyclic aromatic hydrocarbon (PAH) released from the incomplete combustion of fuels including oil, gasoline, coal and wood, as well as waste materials; it is an intermediate in production of dyes and other chemicals.0.05 ppb
0.92 ppb
No
300 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
3-Hydroxycarbofuran3-Hydroxycarbofuran is a metabolite of the insecticide carbofuran, a fumigant used on rice and alfalfa.0.02 ppb
0.29 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
AldicarbAldicarb is a groundwater contaminant and a neurotoxic insecticide used on agricultural crops.0.01 ppb
0.25 ppb
No
7 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
CarbofuranCarbofuran is a highly toxic insecticide and soil fumigant that had been used on corn, rice and alfalfa; it poses severe risks to children (via diet), agricultural workers and the environment.0.03 ppb
0.55 ppb
No
1.7 ppb
No
40 ppb
MetolachlorMetolachlor is an herbicide applied on corn, soybeans, peanuts, cotton and pod crops.<0.01 ppb
0.03 ppb
No
700 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Aldicarb sulfoneAldicarb sulfone is a groundwater contaminant and a neurotoxic metabolite of the insecticide aldicarb used on agricultural crops.0.03 ppb
0.43 ppb
No
7 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Aldicarb sulfoxideAldicarb sulfoxide is a groundwater contaminant and neurotoxic metabolite of the insecticide aldicarb used on agricultural crops.0.02 ppb
0.4 ppb
No
7 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Oxamyl (Vydate)Oxamyl is a neurotoxic insecticide used on cotton, fruit and vegetable crops (apples, potatoes and tomatoes).0.03 ppb
0.53 ppb
No
10 ppb
No
200 ppb
CarbarylCarbaryl is an agricultural pesticide used on citrus, vegetables and nuts; it is also found in home, garden, lawn and industrial applications.0.02 ppb
0.32 ppb
No
40 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
MethomylMethomyl is a neurotoxic insecticide used on field, fruit and vegetable crops; EPA classifies methomyl as "Restricted Use Pesticide" because of its high acute oral toxicity to humans.0.02 ppb
0.4 ppb
No
200 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Xylenes (total)Xylenes are a group of chemicals produced from petroleum and released as pollutants from chemical, plastics and synthetic fiber industries as well as printing, painting, and laboratory uses.1.34 ppb
26.7 ppb
No
1800 ppb
No
10000 ppb
EthylbenzeneEthylbenzene is a pollutant from petroleum refineries and industrial chemical factories; it is also used to make plastics, and may be present as an impurity in some insecticides.0.27 ppb
5.42 ppb
No
300 ppb
No
700 ppb
MTBEMTBE (methyl tert-butyl ether) is a fuel additive that had been used as an octane enhancer in unleaded gasoline; it contaminates groundwater due to spillage or leakage at gas stations, and has been banned or scheduled for phaseout in most states.0.06 ppb
1.2 ppb
No
13 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Trichloroacetic acidTrichloroacetic acid is a disinfection byproduct regulated by EPA as one of five haloacetic acids that are formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.07 ppb
1 ppb
No
20 ppb
No
60 ppb
Beryllium (total)Beryllium is a metal associated with metal refineries and combustion of fossil fuels, especially coal burning; it is released into the environment from electrical, aerospace and defense industries.0.06 ppb
0.5 ppb
No
1 ppb
No
4 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Contaminants Not Detected - 147 chemicals

1,1,1,2-Tetrachloroethane, 1,1,1-Trichloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethane, 1,1-Dichloroethylene, 1,1-Dichloropropene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,3-Trichlorobenzene, 1,2,3-Trichloropropane, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloroethane, 1,2-Dichloropropane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 2,2-Dichloropropane, 2,4,5-t, 2,4,5-TP (Silvex), 2,4,5-Trichlorophenol, 2,4-d, 2,4-db, 2,4-Dinitrotoluene, 2,6-Dinitrotoluene, 2-Methyl naphthalene, Acenaphthene, Acenaphthylene, Acetochlor, Alachlor (Lasso), Aldrin, Alpha Chlordane, alpha-Lindane, Anthracene, Antimony (total), Aroclor 1016, Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Arsenic (total), Atrazine, Baygon (Propoxur), Bentazon (Basagran), Benzene, Benzo[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, beta-Lindane, bis(2-chloroethyl) ether, bis(2-ethylhexyl) phthalate, Bromobenzene, Bromochloroacetic acid, Bromochloromethane, Bromomethane, Butachlor, Butyl Benzylphthalate, Cadmium (total), Carbon tetrachloride, Chloramben, Chlordane, Chloroethane, Chloromethane, Chrysene, cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Copper, Dacthal, Dalapon, delta-BHC, Di(2-Ethylhexyl) adipate, Di-n-butylphthalate, Di-n-octylphthalate, Dibenzofuran, Dibenz[a,h]anthracene, Dibromomethane, Dicamba, Dichlorodifluoromethane, Dichloromethane (methylene chloride), Dichlorprop, Dieldrin, Dimethylphthalate, Dinoseb, Endosulfan I, Endosulfan II, Endosulfan Sulfate, Endrin, Endrin Aldehyde, EPTC (Eptam), Ethylene dibromide (EDB), Fluoranthene, Fluorobenzene, Gamma Chlordane, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Indeno[1,2,3-cd]pyrene, Isopropylbenzene, Lindane, m- & p- Xylene, m-Dichlorobenzene, Mercury (total inorganic), Methiocarb, Methoxychlor, Metribuzin, Molinate (Ordram), Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (Chlorobenzene), n-Butylbenzene, n-Propylbenzene, Naphthalene, Nitrite, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, p,p'-DDT, p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, para-para DDD, para-para DDE, Picloram, Propachlor, Pyrene, sec-Butylbenzene, Selenium (total), Simazine, Styrene, Terbacil, tert-Butylbenzene, Tetrachloroethylene, Thallium (total), Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichloroethylene, Trichlorofluoromethane, Trifluralin, Uranium-238, Vinyl chloride

Pollution Summary

34Total Contaminants Detected (2004 - 2007)

Barium (total), Chromium (total), Nitrate & nitrite, Nitrate, Beryllium (total), Carbaryl, Methomyl, Oxamyl (Vydate), Aldicarb sulfoxide, Aldicarb sulfone, Metolachlor, Carbofuran, Aldicarb, 3-Hydroxycarbofuran, MTBE, Fluorene, Phenanthrene, Diethylphthalate, Trichloroacetic acid, Dibromoacetic acid, Chloroform, Xylenes (total), Toluene, Ethylbenzene, Lead (total), Di(2-ethylhexyl) phthalate, Pentachlorophenol, Dichloroacetic acid, Total haloacetic acids (HAAs), Bromoform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs), Alpha particle activity

12Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate & nitrite, Nitrate, Carbaryl, Methomyl, Oxamyl (Vydate), Aldicarb sulfoxide, Aldicarb sulfone, Metolachlor, Carbofuran, Aldicarb, 3-Hydroxycarbofuran, Ethylbenzene

9Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Nitrate, Nitrate & nitrite, Lead (total), MTBE, Xylenes (total), Diethylphthalate, Phenanthrene, Carbaryl, Fluorene

16Industrial Pollutants

Barium (total), Chromium (total), Nitrate & nitrite, Nitrate, Beryllium (total), MTBE, Fluorene, Phenanthrene, Diethylphthalate, Xylenes (total), Toluene, Ethylbenzene, Lead (total), Di(2-ethylhexyl) phthalate, Pentachlorophenol, Alpha particle activity

10Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Bromoform, Dibromoacetic acid, Di(2-ethylhexyl) phthalate

6Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Nitrate & nitrite, Barium (total), Lead (total), Alpha particle activity, Chromium (total)

12Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Carbaryl, Methomyl, Aldicarb sulfoxide, Aldicarb sulfone, Metolachlor, Aldicarb, 3-Hydroxycarbofuran, MTBE, Fluorene, Phenanthrene, Diethylphthalate, Lead (total)

EPA Violation Summary

Violation CategoryNumber of Violations
Monitoring
(click see violations)
1

Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.