The Power of Information

National Drinking Water Database


City of Lodi - Stockton, CA


Serves 53,903 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.
2 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
36 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.
24,043 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*
1,2-Dibromo-3-chloropropane (DBCP)1,2-Dibromo-3-chloropropane is a persistent pesticide and groundwater contaminant associated with male sterility and severe reproductive toxicity; historically used as a soil fumigant on bananas and pineapples; banned by EPA in early 1980s.0.17 ppb
0.45 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
0.2 ppb
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.4.11 pCi/L
15.9 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
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.0.44 ppb
4.1 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
5 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
2.54 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
1,2,3-Trichloropropane1,2,3-Trichloropropane is an industrial solvent, degreasing agent, and paint and varnish remover.<0.01 ppb
0.18 ppb
Yes
<0.01 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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.4.14 ppb
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
10 ppb
Radium-228Radium-228 is a radioactive element usually found around uranium deposits.0.15 pCi/L
0.46 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
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.0.02 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
80 ppb
Radium-226Radium-226 is a radioactive element usually found around uranium deposits.0.23 pCi/L
0.36 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
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
0.85 ppb
Yes
0.4 ppb
No
80 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
0.9 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
5 ppb
Total polychlorinated biphenyls (PCBs)Polychlorinated biphenyls (PCBs) are a group of highly toxic chlorinated industrial chemicals used as dielectrics, coolants and lubricants in electrical equipment; PCBs contaminate water by leaching from landfills or other waste deposits.<0.01 ppb
0.08 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
0.5 ppb
Thallium (total)Thallium is a highly toxic metal that contaminates the environment due to leaching from ore-processing sites, discharge from electronics, glass, and drug factories and historical use as rodenticide0.03 ppb
0.53 ppb
Yes
0.1 ppb
No
2 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*
1,1-DichloroethyleneIndustrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.0.11 ppb
1.2 ppb
No
7 ppb
No
7 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.3.06 ppm
8.58 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.4.1 pCi/L
11.9 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.101.81 ppb
180 ppb
No
700 ppb
No
2000 ppb
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.0.02 ppb
1.95 ppb
No
9.8 ppb
No
80 ppb
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.0.06 ppb
2.5 ppb
No
30 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use.2.63 ppb
22 ppb
No
50 ppb
No
50 ppb
Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.1.6 ppm
3.73 ppm
No
10 ppm
No
10 ppm
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.0.73 ppb
6.1 ppb
No
100 ppb
No
100 ppb
Mercury (total inorganic)Mercury is a metal from refinery and factory pollution, coal burning, landfill and agricultural runoff and erosion of natural deposits.0.02 ppb
0.21 ppb
No
1.2 ppb
No
2 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.0.29 ppb
4.15 ppb
No
300 ppb
No
1000 ppb
p-Chlorotoluenep-Chlorotoluene is a solvent and intermediate for chemicals and dyes; it may form as a byproduct of water disinfection.<0.01 ppb
0.08 ppb
No
100 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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
0.72 ppb
No
1000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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 2006.0.02 ppb
3.61 ppb
NoLegal 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.0.04 ppb
1 ppb
No
7 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
DiquatDiquat is a non-selective herbicide and dessicant used extensively for control of crop and aquatic weeds; it may cause cataracts.0.31 ppb
6.2 ppb
No
15 ppb
No
20 ppb
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.0.11 ppb
3 ppb
No
200 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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.0.08 ppb
1.7 ppb
No
80 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.0.03 ppb
0.65 ppb
No
50 ppb
No
50 ppb
AluminumAluminum is a metal released from metal refineries and mining operations.0.86 ppb
17.25 ppb
No
200 ppb
No
200 ppb
NitriteNitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.<0.01 ppm
<0.01 ppm
No
1 ppm
No
1 ppm
TrifluralinTrifluralin is an herbicide that acts on grasses and broadleaf weeds, and is used for cotton, alfalfa, tomatoes, home lawns and other applications.<0.01 ppb
0.08 ppb
No
4 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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.0.25 ppb
1.15 ppb
No
5 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.

Contaminants Not Detected - 164 chemicals

1,1,1,2-Tetrachloroethane, 1,1,1-Trichloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethane, 1,1-dichloropropane, 1,1-Dichloropropene, 1,2,3-Trichlorobenzene, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloroethane, 1,2-Dichloropropane, 1,3,5-Trichlorobenzene, 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, 4,4-dde, Acenaphthene, Acenaphthylene, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldrin, Ametryn, Anthracene, Antimony (total), Atrazine, Baygon (Propoxur), Bentazon (Basagran), Benzene, Benzo[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, Beryllium (total), bis(2-chloroethyl) ether, Bromacil, Bromide, Bromobenzene, Bromochloromethane, Bromodichloromethane, Bromomethane, Butachlor, Butylate (Sutan), Cadmium (total), Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chlorobenzilate, Chloroethane, Chloroform, Chloroneb, Chlorothalonil (Bravo), Chlorpropham, Chrysene, cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Cis-permethrin, Cycloate, Dacthal, Dalapon, delta-BHC, Demeton, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Diazinon (Spectracide), Dibenz[a,h]anthracene, Dibromomethane, Dicamba, Dichlorprop, Dichlorvos, Dieldrin, Dimethoate, Dinoseb, Diphenamide, Disulfoton, Endothall, Endrin, EPTC (Eptam), Ethyl-t-butyl ether (ETBE), Ethylbenzene, Ethylene dibromide (EDB), Fenamiphos, Fluoranthene, Fluorene, Glyphosate, Hemellitol (1,2,3-trimethylbenzene), Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Hexazinone, Indeno[1,2,3-cd]pyrene, Isopropyl alcohol, Isopropyl ether, Isopropylbenzene, Lead (total), Lindane, m- & p- Xylene, m-Dichlorobenzene, m-Xylene, Merphos, Methiocarb, Methoxychlor, Methyl ethyl ketone, Methyl isobutyl ketone, Metolachlor, Metribuzin, Molinate (Ordram), Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, Naphthalene, Napropamide, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p,p'-DDT, p-Dichlorobenzene, p-Isopropyltoluene, p-Xylene, para-para DDD, para-para DDE, Pentachlorophenol, Phenanthrene, Picloram, Prometon, Prometryn, Propachlor, Propazine, Pyrene, sec-Butylbenzene, Silver (total), Simazine, Simetryn, Stirofos, Styrene, Tebuthiuron, Terbacil, Terbutryn, Tert-Amyl-Methyl Ether, tert-Butylbenzene, Thiobencarb (Bolero), Toluene, Total haloacetic acids (HAAs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Triadimefon, Trichlorofluoromethane, Trichlorotrifluoroethane, Vinyl chloride, Xylenes (total)

Pollution Summary

36Total Contaminants Detected (2004 - 2009)

Aluminum, Barium (total), Chromium (total), Copper, Cyanide, Manganese, Mercury (total inorganic), Nitrate & nitrite, Nitrate, Nitrite, Selenium (total), Methomyl, Diquat, Aldicarb sulfoxide, Trifluralin, Chloromethane, Dichlorodifluoromethane, Total trihalomethanes (TTHMs), p-Chlorotoluene, 1,1-Dichloroethylene, Perchlorate, Combined Uranium (pCi/L), Arsenic (total), Thallium (total), Total polychlorinated biphenyls (PCBs), 1,2,3-Trichloropropane, 1,2-Dibromo-3-chloropropane (DBCP), Bromoform, Dibromochloromethane, Dichloromethane (methylene chloride), Trichloroethylene, Tetrachloroethylene, Radium-226, Radium-228, Alpha particle activity

12Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate, Nitrate & nitrite, Arsenic (total), Selenium (total), Nitrite, Perchlorate, 1,2-Dibromo-3-chloropropane (DBCP), Cyanide, Diquat, Aldicarb sulfoxide, Methomyl, Trifluralin

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

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

26Industrial Pollutants

Aluminum, Barium (total), Chromium (total), Cyanide, Manganese, Mercury (total inorganic), Nitrate & nitrite, Nitrate, Nitrite, Selenium (total), Chloromethane, Dichlorodifluoromethane, p-Chlorotoluene, 1,1-Dichloroethylene, Perchlorate, Combined Uranium (pCi/L), Arsenic (total), Thallium (total), Total polychlorinated biphenyls (PCBs), 1,2,3-Trichloropropane, Dichloromethane (methylene chloride), Trichloroethylene, Tetrachloroethylene, Radium-226, Radium-228, Alpha particle activity

4Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Dibromochloromethane, Bromoform, Chloromethane

17Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

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

9Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Methomyl, Aldicarb sulfoxide, Trifluralin, Chloromethane, Dichlorodifluoromethane, p-Chlorotoluene, Perchlorate, Tert-Butyl Alcohol, 1,2,3-Trichloropropane

EPA Violation Summary

Violation CategoryNumber of Violations
MCL and Treatment
(click see violations)
1
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.