The Power of Information

National Drinking Water Database


Valley County Water Dist. - Los Angeles, CA


Serves 55,000 people - Test data available: 2004-2009

This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the California Department 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.
18 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.
4 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
38 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.
89,050 tests
420

Contaminants Exceeding Health Guidelines

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
TrichloroethyleneTrichloroethylene is used to remove grease from fabricated metal parts and in the production of some textiles; this pollutant comes from metal degreasing sites, metal finishing and rubber processing industries.0.6 ppb
14.25 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
Yes
5 ppb
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.3.32 ppm
18.07 ppm
Yes
10 ppm
Yes
10 ppm
1,1-DichloroethyleneIndustrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.0.56 ppb
14 ppb
Yes
7 ppb
Yes
7 ppb
TetrachloroethyleneTetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.0.27 ppb
10.67 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
Yes
5 ppb
PerchloratePerchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.1.85 ppb
17 ppb
Yes
5 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
1,2,3-Trichloropropane1,2,3-Trichloropropane is an industrial solvent, degreasing agent, and paint and varnish remover.0.28 ppb
18.17 ppb
Yes
<0.01 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Carbon tetrachlorideCarbon tetrachloride is an industrial solvent and refrigerant released as a pollutant from various chemical plants and the petroleum refining industry.0.02 ppb
0.7 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
5 ppb
1,2-Dichloroethane1,2-Dichloroethane is a chemical used in the production of vinyl chloride; it is released as a pollutant from industrial chemical factories.0.01 ppb
0.79 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
5 ppb
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.<0.01 ppb
0.75 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
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.1.38 pCi/L
6.1 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
Combined Radium (-226 & -228)Radium is a radioactive element usually found around uranium deposits.0.31 pCi/L
1.1 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
5 pCi/L
Radium-226Radium-226 is a radioactive element usually found around uranium deposits.0.23 pCi/L
1.1 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
5 pCi/L
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.<0.01 ppb
0.05 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
Arsenic (total)Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.0.78 ppb
3 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
10 ppb
Dichloromethane (methylene chloride)Dichloromethane is a widely-used paint remover, solvent and metal degreasing agent; it is discharged into the environment from the manufacture of chemicals, textiles, electronics, metals and plastics, pharmaceuticals and pesticides.<0.01 ppb
0.35 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
5 ppb
n-Nitrosodimethylaminen-Nitrosodimethylamine is a carcinogenic water contaminant released from various industrial processes; it also forms in drinking water as disinfection byproduct of chloramination and from agricultural runoff.<0.01 ppb
<0.01 ppb
Yes
<0.01 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Radium-228Radium-228 is a radioactive element usually found around uranium deposits.0.06 pCi/L
0.6 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
5 pCi/L
FormaldehydeFormaldehyde is a chemical found in plastics, resins used for rug and fabric coatings and adhesives for particle board; it is an air pollutant and probable human carcinogen and may form as a byproduct of tap water disinfection.7007 ppb
14000 ppb
Yes
1000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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*
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.0.07 ppb
2.5 ppb
No
9.8 ppb
No
80 ppb
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.0.05 ppb
1.16 ppb
No
5.7 ppb
No
80 ppb
cis-1,2-Dichloroethylenecis-1,2-Dichloroethylene is a pollutant discharged by various industrial chemical factories from the manufacture of plastic wrap, adhesives and synthetic fiber.0.18 ppb
4.53 ppb
No
70 ppb
No
70 ppb
1,1-Dichloroethane1,1-Dichloroethane is used in industrial chemical synthesis, as a solvent for plastics, paint, varnish, and finish removers and as an insecticide/fumigant.0.05 ppb
1.45 ppb
No
3 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
1,1,1-Trichloroethane1,1,1-Trichloroethane is an industrial cleaning solvent that contaminates drinking water sources due to releases from metal degreasing sites and chemicals factories.0.03 ppb
1.18 ppb
No
200 ppb
No
200 ppb
Combined Uranium (pCi/L)Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture.2.52 pCi/L
6.2 pCi/L
NoNo
15 pCi/L
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.114.1 ppb
200 ppb
No
700 ppb
No
2000 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.<0.01 ppb
0.26 ppb
No
0.4 ppb
No
80 ppb
DichlorodifluoromethaneDichlorodifluoromethane (Freon 12) is a chlorofluorocarbon refrigerant and aerosol spray propellant; it was banned under the Montreal Protocol as of 2000 because of its ozone-depleting properties.<0.01 ppb
0.09 ppb
No
1000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
ChloromethaneChloromethane is a naturally occuring chemical that forms during combustion of plant material; it may be released from the manufacture of silicone, rubber and pesticides, and also forms as a byproduct of water disinfection.<0.01 ppb
1.08 ppb
No
30 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
AcetaldhydeAcetaldehyde is a widely-used industrial chemical and common air pollutant; it is released into the environment from chemical manufacturing and from the combustion of fossil fuels.3.55 ppb
4.7 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
GlyoxalGlyoxal is a synthetic chemical used for production of paper coatings, textiles and polymers and as an intermediate for making other chemicals; it is used as a disinfectant in medicine and may form as a byproduct of tap water ozonation.5.1 ppb
7 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.1.67 ppm
2.13 ppm
No
10 ppm
No
10 ppm
Chromium (hexavalent)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.2.79 ppb
3.33 ppb
NoNo
100 ppb
IsopropylbenzeneIsopropylbenzene is an intermediate in industrial chemical production, and is also used as a thinner for paints and enamels and a component of fuel; it is released from petroleum refining, evaporation and combustion.<0.01 ppb
0.85 ppb
No
700 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
o-Dichlorobenzeneo-Dichlorobenzene (1,2-Dichlorobenzene) is an intermediate for making herbicides; it is discharged as a pollutant from the manufacture of agricultural chemicals.0.03 ppb
9 ppb
No
420 ppb
No
600 ppb
Methyl ethyl ketoneMethyl ethyl ketone is a synthetic chemical used as a solvent for paints, coatings, adhesives, printing inks, and other industrial and consumer goods; it occurs naturally in some vegetation and forms during ozonation of drinking water. 0.02 ppb
5.89 ppb
No
4000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
1,4-Dioxane1,4-Dioxane is a stabilizing chemical in industrial solvents and an emerging groundwater pollutant from solvent recycling and plastic manufacturing; it is a probable human carcinogen.0.01 ppb
0.85 ppb
No
3 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Mercury (total inorganic)Mercury is a metal from refinery and factory pollution, coal burning, landfill and agricultural runoff and erosion of natural deposits.0.04 ppb
0.4 ppb
No
1.2 ppb
No
2 ppb
VanadiumVanadium is a metal used as an alloying addition to iron & steel; it is discharged from ceramic, glass, textile, photography, metallurgy and rubber industries.6.11 ppb
18.33 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
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 - 100 chemicals

1,1,1,2-Tetrachloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloropropene, 1,2,3-Trichlorobenzene, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloropropane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 1,3-Dichloropropene, 2,2-Dichloropropane, 2,4,5-TP (Silvex), 2,4-d, 2-Chloroethylvinyl ether, Acetone, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aluminum, Antimony (total), Asbestos, Atrazine, Bentazon (Basagran), Benzene, Benzo[a]pyrene, Beryllium (total), Bromobenzene, Bromochloromethane, Bromomethane, Cadmium (total), Carbofuran, Chlordane, Chloroethane, Chromium (total), cis-1,3-Dichloropropene, Copper, Cyanide, Dalapon, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Dibromomethane, Dinoseb, Diquat, Endothall, Endrin, Ethyl-t-butyl ether (ETBE), Ethylbenzene, Ethylene dibromide (EDB), Glyphosate, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Isopropyl ether, Lead (total), Lindane, m- & p- Xylene, m-Dichlorobenzene, m-Xylene, Manganese, Methoxychlor, Methyl isobutyl ketone, Molinate (Ordram), Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, Naphthalene, Nitrite, o-Chlorotoluene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, p-Xylene, Pentachlorophenol, Picloram, sec-Butylbenzene, Selenium (total), Silver (total), Simazine, Styrene, Tert-Amyl-Methyl Ether, Tert-Butyl Alcohol, tert-Butylbenzene, Thallium (total), Thiobencarb (Bolero), Toluene, Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichlorofluoromethane, Trichlorotrifluoroethane, Vinyl chloride, Xylenes (total)

Pollution Summary

38Total Contaminants Detected (2004 - 2009)

Arsenic (total), Barium (total), Mercury (total inorganic), Nitrate & nitrite, Nitrate, Chromium (hexavalent), Vanadium, 1,4-Dioxane, Chloromethane, Dichlorodifluoromethane, Methyl ethyl ketone, n-Nitrosodimethylamine, cis-1,2-Dichloroethylene, 1,2,3-Trichloropropane, Acetaldhyde, Glyoxal, Chloroform, Bromoform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs), Formaldehyde, Dichloromethane (methylene chloride), o-Dichlorobenzene, 1,1-Dichloroethylene, 1,1-Dichloroethane, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon tetrachloride, Trichloroethylene, Tetrachloroethylene, Isopropylbenzene, Combined Radium (-226 & -228), Radium-226, Radium-228, Alpha particle activity, Perchlorate, Combined Uranium (pCi/L)

6Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Arsenic (total), Nitrate & nitrite, Nitrate, n-Nitrosodimethylamine, o-Dichlorobenzene, Perchlorate

7Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Arsenic (total), Mercury (total inorganic), Nitrate & nitrite, Nitrate, Methyl ethyl ketone, Dichloromethane (methylene chloride), Tetrachloroethylene

32Industrial Pollutants

Arsenic (total), Barium (total), Mercury (total inorganic), Nitrate & nitrite, Nitrate, Chromium (hexavalent), Vanadium, 1,4-Dioxane, Chloromethane, Dichlorodifluoromethane, Methyl ethyl ketone, n-Nitrosodimethylamine, cis-1,2-Dichloroethylene, 1,2,3-Trichloropropane, Acetaldhyde, Glyoxal, Formaldehyde, Dichloromethane (methylene chloride), 1,1-Dichloroethylene, 1,1-Dichloroethane, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon tetrachloride, Trichloroethylene, Tetrachloroethylene, Isopropylbenzene, Combined Radium (-226 & -228), Radium-226, Radium-228, Alpha particle activity, Perchlorate, Combined Uranium (pCi/L)

9Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Chloroform, Bromodichloromethane, Dibromochloromethane, Bromoform, Chloromethane, n-Nitrosodimethylamine, Formaldehyde, Glyoxal

12Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Nitrate & nitrite, Barium (total), Arsenic (total), Radium-228, Radium-226, Alpha particle activity, Combined Radium (-226 & -228), Combined Uranium (pCi/L), Chromium (hexavalent), Mercury (total inorganic), Chloromethane

13Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Vanadium, 1,4-Dioxane, Chloromethane, Dichlorodifluoromethane, Methyl ethyl ketone, n-Nitrosodimethylamine, 1,2,3-Trichloropropane, Acetaldhyde, Glyoxal, Formaldehyde, 1,1-Dichloroethane, Isopropylbenzene, Perchlorate

EPA Violation Summary

No violations were reported for this system since 2004.

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.