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Tap water quality report

Portsmouth, IA

EPA monitoring detected 10 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
189
people served
10
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

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
TTHM
34.8 µg/L 43%
of the EPA limit 80 µg/L
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Chloroform
14.9 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Lithium
13 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2024
1/1 UCMR-5
Bromodichloromethane
9.85 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Dibromochloromethane
8.155 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Dichloroacetic Acid
2.9 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Bromoform
2.09 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Trichloroacetic Acid
1.95 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Dibromoacetic Acid
1 µg/L
No EPA limit set
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2017
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: PORTSMOUTH WATER SUPPLY · 189 people · 2024
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 WATER SUPPLY 189

Frequently asked questions about Portsmouth tap water

Is Portsmouth tap water safe to drink?

EPA testing detected 10 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, Iowa 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 TTHM, Chloroform, Lithium, Bromodichloromethane, Dibromochloromethane. 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.