The Power of Information

National Drinking Water Database


Calleguas Municipal Water Dist - Ventura, CA


Serves 0 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.
13 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.
3 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
33 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.
2,999 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*
ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use.42.5 ppb
130 ppb
Yes
50 ppb
Yes
50 ppb
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.9.07 pCi/L
41.7 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
Yes
15 pCi/L
Combined Uranium (pCi/L)Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture.7.76 pCi/L
39.15 pCi/L
YesYes
15 pCi/L
RadonRadon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater.473.11 pCi/L
726.5 pCi/L
Yes
1.5 pCi/L
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Radium-226Radium-226 is a radioactive element usually found around uranium deposits.0.14 pCi/L
0.42 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-228Radium-228 is a radioactive element usually found around uranium deposits.0.08 pCi/L
0.26 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.1.85 ppb
4.9 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.3.42 ppb
10.7 ppb
Yes
0.4 ppb
No
80 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.1.82 ppb
7.6 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
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.1.15 ppb
4.63 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
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.8.18 ppb
24.4 ppb
Yes
9.8 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.0.61 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.0.13 ppb
1.4 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
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*
Strontium-90Strontium-90 is a radioactive pollutant from nuclear fallout and possibly weapons and power production.0.55 pCi/L
1.2 pCi/L
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
Gross beta particle activity (pCi/L)Beta particles are a form of radiation frequently associated with nuclear testing and radioactive mineral deposits.2.88 pCi/L
12.95 pCi/L
NoNo
15 pCi/L
TritiumTritium is a pollutant from commercial nuclear reactors, research reactors and government weapons production plants.39.26 pCi/L
213 pCi/L
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
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.41.95 ppb
69.4 ppb
No
700 ppb
No
2000 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.1.09 ppb
3.4 ppb
No
5.7 ppb
No
80 ppb
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.6.79 ppb
50 ppb
No
300 ppb
No
1000 ppb
Mercury (total inorganic)Mercury is a metal from refinery and factory pollution, coal burning, landfill and agricultural runoff and erosion of natural deposits.0.03 ppb
0.12 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.0.47 ppb
2 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
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.0.03 ppm
0.23 ppm
No
10 ppm
No
10 ppm
AluminumAluminum is a metal released from metal refineries and mining operations.8.64 ppb
60 ppb
No
200 ppb
No
200 ppb
Selenium (total)Selenium is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium.1.06 ppb
5.67 ppb
No
50 ppb
No
50 ppb
DibromomethaneDibromomethane is an unregulated byproduct of tap water disinfection and a manufactured chemical used in chemical synthesis and as an ingredient in fire extinguishing fluids.0.08 ppb
0.7 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
BromochloromethaneBromochloromethane is a tap water disinfection byproduct; it is also used as an intermediate in chemical manufacturing and a fire extinguishing agent.0.23 ppb
1.9 ppb
No
50 ppb
Legal 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.0.07 ppm
0.3 ppm
No
10 ppm
No
10 ppm
NitriteNitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.<0.01 ppm
0.07 ppm
No
1 ppm
No
1 ppm
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.0.14 ppb
1.5 ppb
No
100 ppb
No
100 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.0.25 ppb
2.8 ppb
No
300 ppb
No
700 ppb
Chromium (hexavalent)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.<0.01 ppb
0.03 ppb
NoNo
100 ppb
CyanideCyanide is a chemical used in mining and steel/metal, plastic, and pesticide manufacturing; it is applied to roads as road salts, and small quantities occur naturally in some plants.0.36 ppb
2.5 ppb
No
80 ppb
No
200 ppb
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.3.14 ppb
22 ppb
No
1800 ppb
No
10000 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 - 122 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, 1,3-Dichloropropene, 2,2-Dichloropropane, 2,3,7,8-TCDD (Dioxin), 2,4,5-t, 2,4,5-TP (Silvex), 2,4-d, 3-Hydroxycarbofuran, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Antimony (total), Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Asbestos, Atrazine, Bentazon (Basagran), Benzene, Benzo[a]pyrene, Beryllium (total), Bromacil, Bromate, Bromobenzene, Bromomethane, Butachlor, Cadmium (total), Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chloroethane, Chloromethane, cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Dalapon, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Diazinon (Spectracide), Dicamba, Dichlorodifluoromethane, Dieldrin, Dimethoate, Dinoseb, Diquat, Diuron, Endothall, Endrin, Ethyl-t-butyl ether (ETBE), Ethylene dibromide (EDB), Glyphosate, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Isopropylbenzene, Lindane, m- & p- Xylene, m-Dichlorobenzene, Methomyl, Methoxychlor, Metolachlor, Metribuzin, Molinate (Ordram), Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, Naphthalene, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, Paraquat, Pentachlorophenol, Perchlorate, Picloram, Prometryn, Propachlor, sec-Butylbenzene, Silver (total), Simazine, Styrene, Tert-Amyl-Methyl Ether, Tert-Butyl Alcohol, tert-Butylbenzene, Tetrachloroethylene, Thallium (total), Thiobencarb (Bolero), Toluene, Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichloroethylene, Trichlorofluoromethane, Trichlorotrifluoroethane, Vinyl chloride

Pollution Summary

33Total Contaminants Detected (2004 - 2009)

Aluminum, Barium (total), Chromium (total), Copper, Cyanide, Mercury (total inorganic), Nitrate & nitrite, Nitrate, Nitrite, Selenium (total), Chromium (hexavalent), Vanadium, Dibromomethane, Bromochloromethane, Chloroform, Xylenes (total), Ethylbenzene, Tritium, Strontium-90, Gross beta particle activity (pCi/L), Arsenic (total), Lead (total), Manganese, Bromoform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs), Dichloromethane (methylene chloride), Radon, Radium-226, Radium-228, Alpha particle activity, Combined Uranium (pCi/L)

7Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Cyanide, Nitrate & nitrite, Nitrate, Nitrite, Selenium (total), Ethylbenzene, Arsenic (total)

10Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Nitrate, Copper, Nitrate & nitrite, Lead (total), Arsenic (total), Nitrite, Xylenes (total), Mercury (total inorganic), Dichloromethane (methylene chloride), Cyanide

26Industrial Pollutants

Aluminum, Barium (total), Chromium (total), Cyanide, Mercury (total inorganic), Nitrate & nitrite, Nitrate, Nitrite, Selenium (total), Chromium (hexavalent), Vanadium, Dibromomethane, Bromochloromethane, Xylenes (total), Ethylbenzene, Tritium, Strontium-90, Gross beta particle activity (pCi/L), Arsenic (total), Lead (total), Manganese, Dichloromethane (methylene chloride), Radium-226, Radium-228, Alpha particle activity, Combined Uranium (pCi/L)

7Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Chloroform, Bromodichloromethane, Dibromochloromethane, Bromoform, Dibromomethane, Bromochloromethane

20Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Nitrate & nitrite, Barium (total), Lead (total), Arsenic (total), Manganese, Radium-228, Radium-226, Alpha particle activity, Gross beta particle activity (pCi/L), Combined Uranium (pCi/L), Chromium (total), Aluminum, Selenium (total), Nitrite, Radon, Chromium (hexavalent), Mercury (total inorganic), Cyanide

7Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Vanadium, Dibromomethane, Bromochloromethane, Tritium, Strontium-90, Lead (total), Radon

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.