National Drinking Water Database
City of St. Louis Water Division - Saint Louis, MO
Serves 370,000 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 Missouri Department of Natural Resources- Public Drinking Water Program. 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.
Contaminants Exceeding Health Guidelines
Other Detected Contaminants
| Contaminant | Average/ Maximum Result | Health Limit Exceeded | Legal Limit Exceeded | Testing History -Tested  -Detected  -Over Health Guidelines  -Over Legal Limit* |
|---|---|---|---|---|
| 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. | 6.41 ppb 12.8 ppb | No 700 ppb | No 2000 ppb |  |
| Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits. | 2.16 ppm 2.65 ppm | No 10 ppm | No 10 ppm | |
| 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. | 1.33 ppm 2.65 ppm | No 10 ppm | No 10 ppm | |
| 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 - 119 chemicals
1,1,1-Trichloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethylene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,4-Trichlorobenzene, 1,2-Dichloroethane, 1,2-Dichloropropane, 2,3,7,8-TCDD (Dioxin), 2,4,5-TP (Silvex), 2,4-d, 3-Hydroxycarbofuran, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Alpha particle activity (excl radon and uranium), Alpha particle activity (incl. radon & uranium), Alpha particle activity (suspended), Aluminum, Antimony (total), Aroclor 1016, Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Arsenic (total), Asbestos, Benzene, Benzo[a]pyrene, Beryllium (total), Bromate, Bromodichloromethane, Bromoform, Butachlor, Cadmium (total), Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chlorite, Chloroform, Chromium (hexavalent), Chromium (total), cis-1,2-Dichloroethylene, Combined Radium (-226 & -228), Combined Uranium (mg/L), Combined Uranium (pCi/L), Copper, Cyanazine (Bladex), Cyanide, Dalapon, Desethylatrazine, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Dibromoacetic acid, Dibromochloromethane, Dicamba, Dichloroacetic acid, Dichloromethane (methylene chloride), Dieldrin, Dinoseb, Diquat, Endothall, Endrin, Ethylbenzene, Ethylene dibromide (EDB), Glyphosate, Gross beta particle & photon emitters (man-made), Gross beta particle activity (dissolved), Gross beta particle activity (mrem/yr), Gross beta particle activity (pCi/L), Gross beta particle activity (suspended), Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorocyclopentadiene, Lindane, m- & p- Xylene, m-Xylene, Manganese, Mercury (total inorganic), Methomyl, Methoxychlor, Metolachlor, Metribuzin, Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (Chlorobenzene), Nitrite, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Dichlorobenzene, p-Xylene, Pentachlorophenol, Picloram, Propachlor, Radium-226, Radium-228, Selenium (total), Silver (total), Simazine, Styrene, Tetrachloroethylene, Thallium (total), Toluene, Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, Trichloroacetic acid, Trichloroethylene, Uranium-234, Uranium-235, Uranium-238, Vinyl chloride, Xylenes (total)
Pollution Summary
| 8 | Total Contaminants Detected (2004 - 2009) Barium (total), Nitrate & nitrite, Nitrate, Lead (total), Atrazine, Total haloacetic acids (HAAs), Total trihalomethanes (TTHMs), Alpha particle activity |
| 3 | Agricultural Pollutants (pesticides, fertilizer, factory farms) |
| 3 | Sprawl and Urban Pollutants (road runoff, lawn pesticides, human waste) |
| 5 | Industrial Pollutants Barium (total), Nitrate & nitrite, Nitrate, Lead (total), Alpha particle activity |
| 2 | Water Treatment and Distribution Byproducts (pipes and fixtures, treatment chemicals and byproducts) Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs) |
| 5 | Naturally Occurring (naturally present but increased for lands denuded by sprawl, agriculture, or industrial development) Nitrate, Nitrate & nitrite, Barium (total), Lead (total), Alpha particle activity |
| 1 | Unregulated Contaminants EPA has not established a maximum legal limit in tapwater for these contaminants |
EPA Violation Summary
| Violation Category | Number of Violations |
|---|---|
| Reporting (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.