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Tap water quality report

Portsmouth, OH

EPA monitoring detected 21 contaminants across the 1 water supplier serving Portsmouth. 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
40,475
people served
21
contaminants found
Ohio rankings Lead in Ohio PFAS in Ohio

What was found in Portsmouth'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
Fluoride
1148 µg/L 29%
of the EPA limit 4000 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Nitrate
1145 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Nitrate-Nitrite
1123.9999999999995 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Copper
264.7 µg/L 20%
of the EPA limit 1300 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2018
1/1 SYR4
TTHM
76.03 µg/L 95%
of the EPA limit 80 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Barium
44.24 µg/L 2.2%
of the EPA limit 2000 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Chloroform
42.80999999999999 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
24.88 µg/L 41%
of the EPA limit 60 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Bromodichloromethane
24.265 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Dibromochloromethane
19.249999999999993 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Lead
16.415 µg/L 109%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2018
1/1 SYR4
Trichloroacetic Acid
13.159999999999991 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Dichloroacetic Acid
12.275 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Bromoform
4.918999999999999 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Dibromoacetic Acid
4.639999999999999 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Nitrite
3 µg/L 0.3%
of the EPA limit 1000 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.2850000000000001 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
Atrazine
1.0219999999999998 µg/L 34%
of the EPA limit 3 µg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2019
1/1 SYR4
PFOA
0.0054 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2023
1/1 UCMR-5
PFBS
0.0035 µg/L
No EPA limit set
Main supplier: PORTSMOUTH CITY · 40,475 people · 2023
1/1 UCMR-5
Lead
0.0014 mg/L 9.3%
of the EPA limit 0.0150 mg/L
Main supplier: PORTSMOUTH CITY · 40,475 people · 2025
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 Portsmouth

SupplierPopulation served
PORTSMOUTH CITY 40,475

Frequently asked questions about Portsmouth tap water

Is Portsmouth tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Portsmouth. 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 Portsmouth?

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

What contaminants are in Portsmouth's water?

The contaminants EPA monitoring detected in Portsmouth include Fluoride, Nitrate, Nitrate-Nitrite, Copper, TTHM. 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.