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Tap water quality report

The Dalles, City of

EPA monitoring tested this supplier for 103 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
11
detected
13,010
people served
0
health-based violations
Oregon rankingsLead in OregonPFAS in Oregon
Water source
Surface water
Ownership
Local government
Counties served
Wasco

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.

0
health-based violations
29
violations on file
2
still open
ViolationTypeStatusPeriod
MR Monitoring Unaddressed 2026-01-01
MR Monitoring Unaddressed 2026-01-01
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2023-07-01 → 2023-07-31
MR Monitoring Resolved 2023-07-01
MR Monitoring Resolved 2023-07-01

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
30 µg/L 38%
of the EPA limit 80 µg/L
worst single sample: 40 µg/L
141/141 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
28.015 µg/L 47%
of the EPA limit 60 µg/L
worst single sample: 30 µg/L
140/141 SYR4 2012–2019
Copper
120 µg/L 9.2%
of the EPA limit 1300 µg/L
worst single sample: 220 µg/L
67/97 SYR4 2012–2018
Lead
0.00021 mg/L 1.4%
of the EPA limit 0.0150 mg/L
 30/30 LCR 2026
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
worst single sample: 810 µg/L
28/28 SYR4 2012–2019
Lead
5.28 µg/L 35%
of the EPA limit 15 µg/L
worst single sample: 8.1 µg/L
22/100 SYR4 2012–2019
Barium
40.35 µg/L 2%
of the EPA limit 2000 µg/L
worst single sample: 41 µg/L
14/29 SYR4 2012–2019
Lithium
42.1 µg/L
No EPA limit set
 6/10 UCMR-5 2024
Nitrate
160 µg/L 1.6%
of the EPA limit 10000 µg/L
 2/60 SYR4 2012–2019
Nitrate-Nitrite
160 µg/L 1.6%
of the EPA limit 10000 µg/L
 1/29 SYR4 2012–2019
Picloram
0.1000 µg/L 0%
of the EPA limit 500 µg/L
 1/27 SYR4 2012–2018
92 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
THE DALLES, CITY OF
Phone
541-298-2248
Email
[email protected]

Frequently asked questions about The Dalles, City of

Is The Dalles, City of tap water safe to drink?

EPA monitoring detected 11 contaminants in The Dalles, 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 The Dalles, City of's water?

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

How many people does The Dalles, City of serve?

The Dalles, City of reports serving 13,010 people in Oregon, per its EPA record.

Has The Dalles, City of had any water quality violations?

The EPA has 29 violations on file for The Dalles, City of, of which 0 are health-based (a contaminant limit or required treatment was breached) and 2 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.