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Tap water quality report

Knollcrest

EPA monitoring tested this supplier for 68 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

68
contaminants tested
7
detected
66
people served
40
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Private
Counties served
Waukesha

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.

40
health-based violations
326
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2021-08-01 → 2021-08-31
MCL Health-based Resolved 2011-01-01 → 2011-06-29
MCL Health-based Resolved 2011-01-01 → 2011-06-29
MCL Health-based Resolved 2011-01-01 → 2011-06-29

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
Lead
0.0136 mg/L 91%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
Lead
3.655 µg/L 24%
of the EPA limit 15 µg/L
worst single sample: 3.7 µg/L
10/10 SYR4 2014–2017
Copper
110 µg/L 8.5%
of the EPA limit 1300 µg/L
 9/10 SYR4 2014–2017
Di(2-ethylhexyl) Phthalate
4.1 µg/L 68%
of the EPA limit 6 µg/L
worst single sample: 4.4 µg/L
3/9 SYR4 2012–2018
Nitrate
62 µg/L 0.6%
of the EPA limit 10000 µg/L
 2/14 SYR4 2012–2018
Combined Radium (-226 And -228)
0.8000 pCi/L 16%
of the EPA limit 5 pCi/L
 1/1 SYR4 2015
Fluoride
310 µg/L 7.8%
of the EPA limit 4000 µg/L
 1/1 SYR4 2018
61 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-GammaBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDibromochloromethaneDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Knollcrest

Is Knollcrest tap water safe to drink?

EPA monitoring detected 7 contaminants in Knollcrest'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 Knollcrest's water?

EPA monitoring detected Lead, Lead, Copper, Di(2-ethylhexyl) Phthalate, Nitrate, and others. The full list with the level and data source for each is above.

How many people does Knollcrest serve?

Knollcrest reports serving 66 people in Wisconsin, per its EPA record.

Has Knollcrest had any water quality violations?

The EPA has 326 violations on file for Knollcrest, of which 40 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.