Overview
EWG's drinking water quality report for Ohio shows results of tests conducted by the water utilities in Ohio and provided to EWG by the Ohio Environmental Protection Agency - Division of Drinking and Ground Waters.
Large utilities in Ohio
Below are utilities in Ohio serving over 10,000 people, listed alphabetically.
| Utility | Location | People Served |
|---|
Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Ohio
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|
Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Ohio
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|
Contaminants found in Ohio above health guidelines
| Found above health guidelines | Found | |||
|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served |
| Bromodichloromethane | 1,064 | 10,418,534 | 1,083 | 10,423,825 | ||
| Dibromochloromethane | 1,042 | 10,395,017 | 1,066 | 10,407,782 | ||
| Total trihalomethanes (TTHMs) | 1,040 | 10,375,009 | 1,047 | 10,444,216 | ||
| Chloroform | 920 | 10,289,789 | 1,093 | 10,496,689 | ||
| Haloacetic acids (HAA5) | 869 | 10,191,708 | 869 | 10,191,708 | ||
| Dibromoacetic acid | 882 | 10,168,500 | 887 | 10,199,168 | ||
| Dichloroacetic acid | 885 | 10,106,983 | 932 | 10,262,602 | ||
| Trichloroacetic acid | 772 | 9,521,473 | 795 | 9,623,842 | ||
| Haloacetic acids (HAA9) | 322 | 9,286,481 | 322 | 9,286,481 | ||
| Nitrate | 563 | 7,899,135 | 874 | 9,333,100 | ||
| Chromium (hexavalent) | 228 | 7,830,173 | 292 | 8,793,280 | ||
| Nitrate & nitrite | 467 | 6,119,443 | 700 | 7,333,015 | ||
| Bromoform | 489 | 5,558,069 | 981 | 10,103,673 | ||
| Bromochloroacetic acid | 123 | 2,629,414 | 123 | 2,629,414 | ||
| Radium, combined (-226 & -228) | 318 | 2,424,749 | 333 | 2,812,762 | ||
| Perfluorooctane sulfonate (PFOS) | 73 | 1,946,032 | 73 | 1,946,032 | ||
| Arsenic | 200 | 1,490,817 | 200 | 1,490,817 | ||
| Perfluorooctanoic acid (PFOA) | 79 | 982,725 | 80 | 995,525 | ||
| Perfluorohexane sulfonate (PFHXS) | 53 | 950,063 | 53 | 950,063 | ||
| Chlorate | 8 | 508,786 | 179 | 7,031,732 | ||
| Atrazine | 20 | 331,141 | 95 | 2,325,185 | ||
| 1,4-Dioxane | 4 | 175,529 | 118 | 3,941,229 | ||
| Thallium | 26 | 129,056 | 29 | 182,261 | ||
| Chlorite | 8 | 120,448 | 15 | 720,167 | ||
| Tetrachloroethylene (perchloroethylene) | 14 | 103,878 | 18 | 107,694 | ||
| Perfluorononanoic acid (PFNA) | 5 | 50,459 | 5 | 50,459 | ||
| Bromate | 4 | 44,061 | 15 | 1,429,202 | ||
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) | 2 | 40,809 | 2 | 40,809 | ||
| Bromochloromethane | 4 | 34,987 | 12 | 91,010 | ||
| Carbon tetrachloride | 5 | 22,834 | 18 | 97,490 | ||
| Manganese | 17 | 21,460 | 321 | 7,898,681 | ||
| Cadmium | 10 | 19,003 | 10 | 19,003 | ||
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | 2 | 14,025 | 5 | 105,003 | ||
| Benzo[a]pyrene | 6 | 8,861 | 6 | 8,861 | ||
| Uranium, combined (pCi/L) | 3 | 3,569 | 3 | 3,569 |
Contaminants found in Ohio above legal limits
| Contaminant | # of Utilities | People Served |
|---|
Total trihalomethanes (TTHMs) | 7 | 9,265 | |
Arsenic | 1 | 393 |
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