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Tap water quality report

Keystone, IA

EPA monitoring detected 13 contaminants across the 1 water supplier serving Keystone. 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
599
people served
13
contaminants found
Iowa rankings Lead in Iowa PFAS in Iowa

What was found in Keystone'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
3500 µg/L 35%
of the EPA limit 10000 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Fluoride
1590 µg/L 40%
of the EPA limit 4000 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2012
1/1 SYR4
Nitrite
565 µg/L 56%
of the EPA limit 1000 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Copper
201.6 µg/L 16%
of the EPA limit 1300 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2018
1/1 SYR4
Lead
17.09 µg/L 114%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2018
1/1 SYR4
Barium
6.795 µg/L 0.3%
of the EPA limit 2000 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2012
1/1 SYR4
Toluene
2.6 µg/L 0.3%
of the EPA limit 1000 µg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2018
1/1 SYR4
Combined Radium (-226 And -228)
2.38 pCi/L 48%
of the EPA limit 5 pCi/L
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.364 µg/L
No EPA limit set
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Trichloroacetic Acid
0.7960 µg/L
No EPA limit set
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Bromoform
0.7800 µg/L
No EPA limit set
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Dibromoacetic Acid
0.5700 µg/L
No EPA limit set
Main supplier: KEYSTONE WATER SUPPLY · 599 people · 2019
1/1 SYR4
Lead
0.0059 mg/L 39%
of the EPA limit 0.0150 mg/L
Main supplier: KEYSTONE WATER SUPPLY · 599 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 Keystone

SupplierPopulation served
KEYSTONE WATER SUPPLY 599

Frequently asked questions about Keystone tap water

Is Keystone tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Keystone. 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 Keystone?

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

What contaminants are in Keystone's water?

The contaminants EPA monitoring detected in Keystone include Nitrate, Fluoride, Nitrite, Copper, Lead. 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.