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Tap water quality report

Ottawa, OH

EPA monitoring detected 25 contaminants across the 1 water supplier serving Ottawa. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
4,393
people served
25
contaminants found
Ohio rankings Lead in Ohio PFAS in Ohio

What was found in Ottawa's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
3025 µg/L 30%
of the EPA limit 10000 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Nitrate
2755.5 µg/L 28%
of the EPA limit 10000 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Fluoride
1182.5 µg/L 30%
of the EPA limit 4000 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Copper
109.55 µg/L 8.4%
of the EPA limit 1300 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Barium
103.065 µg/L 5.2%
of the EPA limit 2000 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
TTHM
102.032 µg/L 128%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Chloroform
67.036 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
49 µg/L 82%
of the EPA limit 60 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Dichloroacetic Acid
31.102 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Bromodichloromethane
25.288 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Trichloroacetic Acid
14.84 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Lithium
11.9 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2024
1/1 UCMR-5
Dibromochloromethane
11.388 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Lead
8.468 µg/L 56%
of the EPA limit 15 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2017
1/1 SYR4
Monochloroacetic Acid
5.7665 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Dibromoacetic Acid
4.335 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Atrazine
2.605 µg/L 87%
of the EPA limit 3 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Monobromoacetic Acid
2.265 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Bromoform
1.2465 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Simazine
0.3552 µg/L 8.9%
of the EPA limit 4 µg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2019
1/1 SYR4
Pfpea
0.0904 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2024
1/1 UCMR-5
Pfhxa
0.0518 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2024
1/1 UCMR-5
Pfba
0.0124 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2024
1/1 UCMR-5
PFBS
0.0081 µg/L
No EPA limit set
Main supplier: OTTAWA VILLAGE · 4,393 people · 2024
1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: OTTAWA VILLAGE · 4,393 people · 2023
1/1 LCR
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Ottawa

SupplierPopulation served
OTTAWA VILLAGE 4,393

Frequently asked questions about Ottawa tap water

Is Ottawa tap water safe to drink?

EPA testing detected 25 contaminants in the water serving Ottawa. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Ottawa?

1 public water supplier report drinking-water monitoring for Ottawa, Ohio to the EPA. Each is listed above with its population served.

What contaminants are in Ottawa's water?

The contaminants EPA monitoring detected in Ottawa include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.

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.