Is Tualatin Valley Water District Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Washington

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2001-04-01 → 2001-04-30

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	413.5 µg/L 32% of the EPA limit 1300 µg/L worst single sample: 941 µg/L	1346/1544	SYR4	2012–2019
Lead	22.7 µg/L 151% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 648 µg/L	1264/1546	SYR4	2012–2019
TTHM	45.9 µg/L 57% of the EPA limit 80 µg/L worst single sample: 62.6 µg/L	241/241	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	43.2 µg/L 72% of the EPA limit 60 µg/L worst single sample: 52.8 µg/L	233/241	SYR4	2012–2019
Lead	0.0045 mg/L 30% of the EPA limit 0.0150 mg/L	57/57	LCR	2025
Nitrate	756 µg/L 7.6% of the EPA limit 10000 µg/L worst single sample: 800 µg/L	32/38	SYR4	2012–2019
Fluoride	656 µg/L 16% of the EPA limit 4000 µg/L worst single sample: 700 µg/L	12/14	SYR4	2012–2019
Nitrate-Nitrite	695.5 µg/L 7% of the EPA limit 10000 µg/L worst single sample: 800 µg/L	11/14	SYR4	2012–2019
Barium	3.585 µg/L 0.2% of the EPA limit 2000 µg/L worst single sample: 3.81 µg/L	10/15	SYR4	2012–2019
Chromium	2.864 µg/L 2.9% of the EPA limit 100 µg/L worst single sample: 3.08 µg/L	5/15	SYR4	2012–2019
Combined Uranium	0.0880 µg/L 0.3% of the EPA limit 30 µg/L	1/5	SYR4	2013–2018
Gross Beta Particle Activity	0.9980 pCi/L No EPA limit set	1/6	SYR4	2012–2018

91 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross 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: TUALATIN VALLEY WATER DISTRICT
Phone: 971-277-8813
Email: [email protected]

Frequently asked questions about Tualatin Valley Water District

Is Tualatin Valley Water District tap water safe to drink?

EPA monitoring detected 12 contaminants in Tualatin Valley Water District'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 Tualatin Valley Water District's water?

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

How many people does Tualatin Valley Water District serve?

Tualatin Valley Water District reports serving 224,600 people in Oregon, per its EPA record.

Has Tualatin Valley Water District had any water quality violations?

The EPA has 1 violation on file for Tualatin Valley Water District, of which 0 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.