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The Dalles, OR Tap Water Quality 2026

Water quality report for The Dalles, OR — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at The Dalles's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: The Dalles, City Of PWSID: OR4100869 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 0.21 ppb, 1% of the action level and no violations are open. No PFAS was detected.

A

The Dalles earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 0.21 ppb — 1% of the federal action level
PFAS tested, none detected
19 violations since 2015, 0 health-based
No violations currently open
The Dalles's lead level vs. all Oregon community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 0.21 ppb — 1% of the federal action level
✓ Lower lead than 100% of Oregon utilities
Population Served
15765
~5408 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
19 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
1% of EPA action level
0.21 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
143.1% of EPA action level
1,860 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 0.21 ppb, 1% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2026 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2026 Unaddressed
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2025 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2019 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2018 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

19 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility The Dalles, City Of
PWSID OR4100869
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 15,765
Service connections 5,408
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is The Dalles tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 0.21 ppb, 1% of the action level.
Does The Dalles water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to The Dalles? ▼
The Dalles, City Of (PWSID OR4100869), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2023-07-19. No significant deficiencies were recorded.

What Should The Dalles Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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