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Tap water quality report

Ontario City

EPA monitoring tested this supplier for 82 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
14
detected
6,756
people served
0
health-based violations
Ohio rankingsLead in OhioPFAS in Ohio
Water source
Ground water
Ownership
Local government
Counties served
Richland

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
71
violations on file
1
still open
ViolationTypeStatusPeriod
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
Other Monitoring Unaddressed 2018-12-13
Other Monitoring Resolved 2002-07-01
Other Monitoring Resolved 2002-07-01
MR Monitoring Resolved 1999-07-01 → 1999-12-31
MR Monitoring Resolved 1999-07-01 → 1999-12-31
MR Monitoring Resolved 1999-07-01 → 1999-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
201.6 µg/L 16%
of the EPA limit 1300 µg/L
worst single sample: 933 µg/L
77/81 SYR4 2014–2019
Lead
0.0027 mg/L 18%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2025
Bromodichloromethane
8.84 µg/L
No EPA limit set
worst single sample: 10.1 µg/L
15/15 SYR4 2012–2019
Chloroform
12.68 µg/L
No EPA limit set
worst single sample: 13.1 µg/L
15/15 SYR4 2012–2019
Dibromochloromethane
5.51 µg/L
No EPA limit set
worst single sample: 6 µg/L
15/15 SYR4 2012–2019
TTHM
29.15 µg/L 36%
of the EPA limit 80 µg/L
worst single sample: 30.2 µg/L
15/15 SYR4 2012–2019
Bromoform
2.705 µg/L
No EPA limit set
worst single sample: 2.9 µg/L
14/15 SYR4 2012–2019
Trichloroacetic Acid
1.4625 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
6/15 SYR4 2012–2019
Fluoride
1008 µg/L 25%
of the EPA limit 4000 µg/L
worst single sample: 1020 µg/L
3/3 SYR4 2013–2019
Lead
30.16 µg/L 201%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 32.3 µg/L
3/81 SYR4 2014–2019
Barium
33.505 µg/L 1.7%
of the EPA limit 2000 µg/L
worst single sample: 33.9 µg/L
2/3 SYR4 2013–2019
Dichloroacetic Acid
1.295 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
2/15 SYR4 2012–2019
Lithium
14.3 µg/L
No EPA limit set
 2/2 UCMR-5 2023
Arsenic
3.6 µg/L 36%
of the EPA limit 10 µg/L
 1/3 SYR4 2013–2019
68 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDibromoacetic AcidEthylbenzeneHfpo-DaLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)TrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MORTON, MICHAEL
Phone
567-437-5830
Email
[email protected]

Frequently asked questions about Ontario City

Is Ontario City tap water safe to drink?

EPA monitoring detected 14 contaminants in Ontario City's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Ontario City's water?

EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Ontario City serve?

Ontario City reports serving 6,756 people in Ohio, per its EPA record.

Has Ontario City had any water quality violations?

The EPA has 71 violations on file for Ontario City, of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.