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Tap water quality report

Oregon Waterworks

EPA monitoring tested this supplier for 105 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
18
detected
11,200
people served
11
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Dane

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.

11
health-based violations
45
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MCL Health-based Resolved 1994-06-01 → 1994-06-30
MCL Health-based Resolved 1994-06-01 → 1994-06-30

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
Fluoride
962 µg/L 24%
of the EPA limit 4000 µg/L
worst single sample: 1090 µg/L
100/196 SYR4 2012–2019
Copper
306 µg/L 24%
of the EPA limit 1300 µg/L
worst single sample: 410 µg/L
41/42 SYR4 2014–2017
Nitrate-Nitrite
5613 µg/L 56%
of the EPA limit 10000 µg/L
worst single sample: 6020 µg/L
39/39 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2023
Lead
115.95 µg/L 773%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 396 µg/L
16/42 SYR4 2014–2017
TTHM
5.733 µg/L 7.2%
of the EPA limit 80 µg/L
worst single sample: 5.76 µg/L
10/15 SYR4 2013–2019
Nitrate
6020 µg/L 60%
of the EPA limit 10000 µg/L
 8/8 SYR4 2014–2017
Dibromochloromethane
1.8 µg/L
No EPA limit set
 7/34 SYR4 2012–2019
Bromodichloromethane
1.575 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
6/34 SYR4 2012–2019
Chloroform
1.46 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
5/34 SYR4 2012–2019
Barium
26.5 µg/L 1.3%
of the EPA limit 2000 µg/L
worst single sample: 28.3 µg/L
4/4 SYR4 2014–2017
Combined Radium (-226 And -228)
1.60385 pCi/L 32%
of the EPA limit 5 pCi/L
worst single sample: 1.64 pCi/L
4/4 SYR4 2014–2017
Bromoform
0.9960 µg/L
No EPA limit set
worst single sample: 1 µg/L
3/34 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
4.345 pCi/L 29%
of the EPA limit 15 pCi/L
worst single sample: 4.53 pCi/L
3/3 SYR4 2014–2017
Combined Uranium
0.8458 µg/L 2.8%
of the EPA limit 30 µg/L
worst single sample: 0.8600 µg/L
2/2 SYR4 2017
Chromium
1.75 µg/L 1.8%
of the EPA limit 100 µg/L
 1/4 SYR4 2014–2017
Tetrachloroethylene
0.1000 µg/L 2%
of the EPA limit 5 µg/L
 1/34 SYR4 2012–2019
Xylenes, Total
0.2800 µg/L 0%
of the EPA limit 10000 µg/L
 1/34 SYR4 2012–2019
87 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDibromoacetic AcidDichloroacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Oregon Waterworks

Is Oregon Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Oregon 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 Oregon Waterworks's water?

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

How many people does Oregon Waterworks serve?

Oregon Waterworks reports serving 11,200 people in Wisconsin, per its EPA record.

Has Oregon Waterworks had any water quality violations?

The EPA has 45 violations on file for Oregon Waterworks, of which 11 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.