States ›Oregon ›Polk County ›Monmouth

Monmouth, OR Tap Water Quality 2026

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

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

Main Utility: Monmouth, City Of PWSID: OR4100537 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

B

Monmouth earns a B for water quality

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

Lead: not detected
PFAS tested, none detected
10 violations since 2015, 1 health-based
No violations currently open
Monmouth's lead level vs. all Oregon community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Oregon utilities
Population Served
11097
~3027 connections
Water Source
Surface water
Groundwater under the direct influence of surface water — SDWIS source code GU
Active Violations
0
10 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
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.
198.5% of EPA action level
2,580 ppb
Action level: 1,300 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2020 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2015 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

10 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Monmouth, City Of
PWSID OR4100537
Water source Surface water — Groundwater under the direct influence of surface water — SDWIS source code GU
Population served 11,097
Service connections 3,027
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Monmouth tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Monmouth water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Monmouth? ▼
Monmouth, City Of (PWSID OR4100537), one of 3 systems serving this area. Surface water. Groundwater under the direct influence of surface water — SDWIS source code GU
When was this system last inspected? ▼
It was last inspected on 2025-10-23. No significant deficiencies were recorded.

What Should Monmouth 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.

Nearby Cities in Oregon

Dallas, Or Tap Water Quality 2026 Polk Independence, Or Tap Water Quality 2026 Polk Grand Ronde, Or Tap Water Quality 2026 Polk Falls City, Or Tap Water Quality 2026 Polk Fort Hill, Or Tap Water Quality 2026 Polk Rickreall, Or Tap Water Quality 2026 Polk