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Tap water quality report

Keystone Water Supply

EPA monitoring tested this supplier for 61 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

61
contaminants tested
13
detected
599
people served
25
health-based violations
Iowa rankingsLead in IowaPFAS in Iowa
Water source
Ground water
Ownership
Local government
Counties served
Benton

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.

25
health-based violations
107
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2021-05-01 → 2021-05-31
TT Health-based Resolved 2021-05-01 → 2021-05-31
MCL Health-based Resolved 2021-04-01 → 2021-04-30
MCL Health-based Resolved 2021-04-01 → 2021-04-30
MCL Health-based Resolved 2021-04-01 → 2021-04-30
MCL Health-based Resolved 2021-04-01 → 2021-04-30
MCL Health-based Resolved 2020-11-01 → 2020-11-30
MCL Health-based Resolved 2020-11-01 → 2020-11-30
MCL Health-based Resolved 2020-11-01 → 2020-11-30
MCL Health-based Resolved 2020-11-01 → 2020-11-30

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
Nitrite
565 µg/L 56%
of the EPA limit 1000 µg/L
worst single sample: 1830 µg/L
39/208 SYR4 2012–2019
Copper
201.6 µg/L 16%
of the EPA limit 1300 µg/L
worst single sample: 302 µg/L
30/30 SYR4 2012–2018
Lead
17.09 µg/L 114%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 22.7 µg/L
18/30 SYR4 2012–2018
Lead
0.0059 mg/L 39%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2024
Nitrate
3500 µg/L 35%
of the EPA limit 10000 µg/L
 12/40 SYR4 2012–2019
Combined Radium (-226 And -228)
2.38 pCi/L 48%
of the EPA limit 5 pCi/L
worst single sample: 2.5 pCi/L
3/4 SYR4 2013–2019
Barium
6.795 µg/L 0.3%
of the EPA limit 2000 µg/L
worst single sample: 6.8 µg/L
2/2 SYR4 2012
Fluoride
1590 µg/L 40%
of the EPA limit 4000 µg/L
worst single sample: 1600 µg/L
2/2 SYR4 2012
Monochloroacetic Acid
2.364 µg/L
No EPA limit set
worst single sample: 2.39 µg/L
2/7 SYR4 2013–2019
Trichloroacetic Acid
0.7960 µg/L
No EPA limit set
worst single sample: 0.8100 µg/L
2/7 SYR4 2013–2019
Bromoform
0.7800 µg/L
No EPA limit set
 1/7 SYR4 2013–2019
Dibromoacetic Acid
0.5700 µg/L
No EPA limit set
 1/7 SYR4 2013–2019
Toluene
2.6 µg/L 0.3%
of the EPA limit 1000 µg/L
 1/11 SYR4 2012–2018
48 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBenzeneBenzo(A)PyreneBromodichloromethaneChlorobenzeneCadmiumCarbon TetrachlorideChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylbenzeneGlyphosateLassoMercuryMonobromoacetic AcidPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTotal Haloacetic Acids (HAA5)TrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KEYSTONE WATER SUPPLY
Phone
319-202-4956
Email
[email protected]

Frequently asked questions about Keystone Water Supply

Is Keystone Water Supply tap water safe to drink?

EPA monitoring detected 13 contaminants in Keystone Water Supply'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 Keystone Water Supply's water?

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

How many people does Keystone Water Supply serve?

Keystone Water Supply reports serving 599 people in Iowa, per its EPA record.

Has Keystone Water Supply had any water quality violations?

The EPA has 107 violations on file for Keystone Water Supply, of which 25 are health-based (a contaminant limit or required treatment was breached) and 0 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.