The Power of Information

National Drinking Water Database


Yosemite Spring Park Util Co - Madera, CA


Serves 3,300 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.
5 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.
1 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
17 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.
7,856 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.200.15 ppb
580 ppb
Yes
50 ppb
Yes
50 ppb
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.4.59 pCi/L
14.7 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
No
15 pCi/L
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.2.45 ppb
8.4 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
10 ppb
Radium-228Radium-228 is a radioactive element usually found around uranium deposits.0.36 pCi/L
1.19 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
5 pCi/L
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.0.06 ppb
0.71 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
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*
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.1.74 ppb
9.4 ppb
No
13 ppb
Legal 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.0.14 ppm
0.9 ppm
No
10 ppm
No
10 ppm
Combined Uranium (pCi/L)Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture.6.09 pCi/L
16.2 pCi/L
NoNo
15 pCi/L
TolueneToluene is a pollutant from petroleum refineries and a chemical used in plastics manufacturing as well as the pharmaceutical, paint and furniture industries.0.03 ppb
1.3 ppb
No
150 ppb
No
1000 ppb
Tert-Butyl Alcoholtert-Butyl alcohol is used in disinfectants, solvents, paints, laboratory chemicals and in numerous industrial processes; over one billion pounds were manufactured in 2006.3.09 ppb
88 ppb
NoLegal at any levelThis is the Federal Limit. State Limits may be lower.
Tert-Amyl-Methyl EtherTert-Amyl-Methyl Ether (TAME) is a synthetic chemical with billions of pounds produced annually; it is used as an oxygenated gasoline additive similar to MTBE, and is a potential groundwater contaminant from leaks of stored gasoline.0.03 ppb
0.7 ppb
NoLegal 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
0.2 ppb
No
30 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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.0.02 ppb
0.25 ppb
No
50 ppb
No
50 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.0.23 ppb
2.5 ppb
No
300 ppb
No
1000 ppb
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.0.01 ppb
0.12 ppb
No
100 ppb
No
100 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.0.49 ppb
5.37 ppb
No
700 ppb
No
2000 ppb
AluminumAluminum is a metal released from metal refineries and mining operations.1.79 ppb
19.69 ppb
No
200 ppb
No
200 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 - 135 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, 2,4,5-t, 2,4,5-TP (Silvex), 2,4-d, 2-Chloroethylvinyl ether, 3-Hydroxycarbofuran, Acetone, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Antimony (total), Asbestos, Atrazine, Bentazon (Basagran), Benzene, Benzo[a]pyrene, Beryllium (total), bis(2-chloroethyl) ether, Bromacil, Bromobenzene, Bromochloromethane, Bromodichloromethane, Bromoform, Bromomethane, Butachlor, Cadmium (total), Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chloroethane, Chloroform, Chlorothalonil (Bravo), cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Cyanide, Dalapon, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Diazinon (Spectracide), Dibromochloromethane, Dibromomethane, Dicamba, Dichlorodifluoromethane, Dichloromethane (methylene chloride), Dieldrin, Dimethoate, Dinoseb, Diquat, Diuron, Endothall, Endrin, EPTC (Eptam), Ethyl-t-butyl ether (ETBE), Ethylbenzene, Ethylene dibromide (EDB), Glyphosate, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Hexachloroethane, Isopropyl alcohol, Isopropyl ether, Isopropylbenzene, Lindane, m- & p- Xylene, m-Dichlorobenzene, Mercury (total inorganic), Methomyl, Methoxychlor, Methyl ethyl ketone, Methyl isobutyl ketone, Metolachlor, Metribuzin, Molinate (Ordram), Monochlorobenzene (Chlorobenzene), n-Butylbenzene, n-Propylbenzene, Naphthalene, Nitrite, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, Pentachlorophenol, Perchlorate, Picloram, Prometon, Prometryn, Propachlor, Radium-226, sec-Butylbenzene, Silver (total), Simazine, Styrene, Terbacil, tert-Butylbenzene, Tetrachloroethylene, Thallium (total), Thiobencarb (Bolero), Total polychlorinated biphenyls (PCBs), Total trihalomethanes (TTHMs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichloroethylene, Trichlorofluoromethane, Trichlorotrifluoroethane, Trifluralin, Vinyl chloride, Xylenes (total)

Pollution Summary

17Total Contaminants Detected (2004 - 2009)

Aluminum, Arsenic (total), Barium (total), Chromium (total), Copper, Lead (total), Manganese, Nitrate, Selenium (total), Chloromethane, MTBE, Toluene, Radium-228, Alpha particle activity, Tert-Amyl-Methyl Ether, Combined Uranium (pCi/L)

3Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Arsenic (total), Nitrate, Selenium (total)

5Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Nitrate, Copper, Lead (total), Arsenic (total), MTBE

15Industrial Pollutants

Aluminum, Arsenic (total), Barium (total), Chromium (total), Lead (total), Manganese, Nitrate, Selenium (total), Chloromethane, MTBE, Toluene, Radium-228, Alpha particle activity, Tert-Amyl-Methyl Ether, Combined Uranium (pCi/L)

1Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Chloromethane

13Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Barium (total), Lead (total), Arsenic (total), Manganese, Radium-228, Alpha particle activity, Combined Uranium (pCi/L), Chromium (total), Aluminum, Selenium (total), Chloromethane

5Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Lead (total), Chloromethane, MTBE, Tert-Butyl Alcohol, Tert-Amyl-Methyl Ether

EPA Violation Summary

Violation CategoryNumber of Violations
Monitoring
(click see violations)
3

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.