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Tap water quality report

Wilsonville, City of

EPA monitoring tested this supplier for 104 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
10
detected
25,915
people served
17
health-based violations
Oregon rankingsLead in OregonPFAS in Oregon
Water source
Surface water
Ownership
Local government
Counties served
Clackamas

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.

17
health-based violations
43
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-10-01 → 1995-10-31
MCL Health-based Resolved 1995-10-01 → 1995-10-31
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
MCL Health-based Resolved 1995-02-01 → 1995-02-28
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
TTHM
23.15 µg/L 29%
of the EPA limit 80 µg/L
worst single sample: 28.9 µg/L
128/128 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
7.6 µg/L 13%
of the EPA limit 60 µg/L
worst single sample: 22 µg/L
119/128 SYR4 2012–2019
Nitrate
933.5 µg/L 9.3%
of the EPA limit 10000 µg/L
worst single sample: 1100 µg/L
68/68 SYR4 2012–2019
Nitrate-Nitrite
876.5 µg/L 8.8%
of the EPA limit 10000 µg/L
worst single sample: 1100 µg/L
34/34 SYR4 2012–2019
Barium
8.98 µg/L 0.4%
of the EPA limit 2000 µg/L
worst single sample: 10 µg/L
33/34 SYR4 2012–2019
Bromate
3.55 µg/L 36%
of the EPA limit 10 µg/L
worst single sample: 4.4 µg/L
28/66 SYR4 2012–2019
Copper
86.6 µg/L 6.7%
of the EPA limit 1300 µg/L
worst single sample: 100 µg/L
27/100 SYR4 2012–2018
Lead
0.0076 mg/L 51%
of the EPA limit 0.0150 mg/L
 22/22 LCR 2024
Lead
6.75 µg/L 45%
of the EPA limit 15 µg/L
worst single sample: 7 µg/L
6/101 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
1.1 µg/L 18%
of the EPA limit 6 µg/L
 1/33 SYR4 2012–2019
94 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WILSONVILLE, CITY OF
Phone
503-570-1542
Email
[email protected]

Frequently asked questions about Wilsonville, City of

Is Wilsonville, City of tap water safe to drink?

EPA monitoring detected 10 contaminants in Wilsonville, City of'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 Wilsonville, City of's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Nitrate, Nitrate-Nitrite, Barium, and others. The full list with the level and data source for each is above.

How many people does Wilsonville, City of serve?

Wilsonville, City of reports serving 25,915 people in Oregon, per its EPA record.

Has Wilsonville, City of had any water quality violations?

The EPA has 43 violations on file for Wilsonville, City of, of which 17 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.