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Tap water quality report

Knapp Waterworks

EPA monitoring tested this supplier for 74 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

74
contaminants tested
10
detected
486
people served
2
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Dunn

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.

2
health-based violations
77
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2025-09-02
TT Health-based Resolved 2025-09-02
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2023-08-01 → 2023-08-31
MON Monitoring Resolved 2023-08-01 → 2023-08-31
MON Monitoring Resolved 2023-08-01 → 2023-08-31
MON Monitoring Resolved 2023-08-01 → 2023-08-31

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
Copper
306.85 µg/L 24%
of the EPA limit 1300 µg/L
worst single sample: 599 µg/L
44/45 SYR4 2014–2019
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2023
Lead
31.4 µg/L 209%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 32 µg/L
7/50 SYR4 2014–2019
Barium
22.7 µg/L 1.1%
of the EPA limit 2000 µg/L
worst single sample: 23 µg/L
4/4 SYR4 2014–2017
Combined Radium (-226 And -228)
1.4975 pCi/L 30%
of the EPA limit 5 pCi/L
worst single sample: 1.5 pCi/L
2/2 SYR4 2014
Bromodichloromethane
0.7800 µg/L
No EPA limit set
 1/2 SYR4 2014–2017
Chloroform
1.3 µg/L
No EPA limit set
 1/2 SYR4 2014–2017
TTHM
2.53 µg/L 3.2%
of the EPA limit 80 µg/L
 1/2 SYR4 2014–2017
Toluene
340 µg/L 34%
of the EPA limit 1000 µg/L
 1/15 SYR4 2012–2017
Total Haloacetic Acids (HAA5)
0.1500 µg/L 0.3%
of the EPA limit 60 µg/L
 1/2 SYR4 2014–2017
64 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, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Knapp Waterworks

Is Knapp Waterworks tap water safe to drink?

EPA monitoring detected 10 contaminants in Knapp Waterworks'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 Knapp Waterworks's water?

EPA monitoring detected Copper, Lead, Lead, Barium, Combined Radium (-226 And -228), and others. The full list with the level and data source for each is above.

How many people does Knapp Waterworks serve?

Knapp Waterworks reports serving 486 people in Wisconsin, per its EPA record.

Has Knapp Waterworks had any water quality violations?

The EPA has 77 violations on file for Knapp Waterworks, of which 2 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.