Tap WaterIndex

← Wisconsin

Tap water quality report

Delafield Waterworks

EPA monitoring tested this supplier for 78 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

78
contaminants tested
12
detected
300
people served
15
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
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.

15
health-based violations
36
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 2001-01-01 → 2005-01-19
MCL Health-based Resolved 1998-01-01 → 1998-12-31
MCL Health-based Resolved 1998-01-01 → 1998-12-31

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
Lead
0.0019 mg/L 12%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Copper
151 µg/L 12%
of the EPA limit 1300 µg/L
worst single sample: 160 µg/L
10/10 SYR4 2014–2017
Lead
2.31 µg/L 15%
of the EPA limit 15 µg/L
worst single sample: 2.4 µg/L
10/10 SYR4 2014–2017
Barium
125.5 µg/L 6.3%
of the EPA limit 2000 µg/L
worst single sample: 130 µg/L
4/4 SYR4 2014–2017
Fluoride
289.5 µg/L 7.2%
of the EPA limit 4000 µg/L
worst single sample: 300 µg/L
4/4 SYR4 2014–2017
Arsenic
6.24 µg/L 62%
of the EPA limit 10 µg/L
worst single sample: 6.4 µg/L
3/4 SYR4 2014–2017
Combined Radium (-226 And -228)
4.259 pCi/L 85%
of the EPA limit 5 pCi/L
worst single sample: 4.39 pCi/L
3/3 SYR4 2014–2017
Combined Uranium
0.4042 µg/L 1.3%
of the EPA limit 30 µg/L
worst single sample: 0.4080 µg/L
2/2 SYR4 2014
Gross Alpha, Excl. Radon And U
5.2814 pCi/L 35%
of the EPA limit 15 pCi/L
worst single sample: 5.33 pCi/L
2/2 SYR4 2014–2017
Nitrate
79 µg/L 0.8%
of the EPA limit 10000 µg/L
 2/24 SYR4 2012–2019
TTHM
1.82 µg/L 2.3%
of the EPA limit 80 µg/L
 1/4 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
0.0510 µg/L 0.1%
of the EPA limit 60 µg/L
 1/4 SYR4 2013–2019
66 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Delafield Waterworks

Is Delafield Waterworks tap water safe to drink?

EPA monitoring detected 12 contaminants in Delafield 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 Delafield Waterworks's water?

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

How many people does Delafield Waterworks serve?

Delafield Waterworks reports serving 300 people in Wisconsin, per its EPA record.

Has Delafield Waterworks had any water quality violations?

The EPA has 36 violations on file for Delafield Waterworks, of which 15 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.