B62/100
MONTESANO CITY OF — Water Quality Report 2026
Serving 5,492 people · Washington
Water Source
Groundwater
County
—
System ID
WA5356000
Violations
15
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.82 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2022 – December 28, 2022Enforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – December 31, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – December 31, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About MONTESANO CITY OF
Is MONTESANO CITY OF water safe to drink?
MONTESANO CITY OF water receives a grade of B (62/100), which is considered good. Out of 32 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MONTESANO CITY OF detected?
32 contaminants were tested in MONTESANO CITY OF's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does MONTESANO CITY OF have any EPA violations?
Yes, MONTESANO CITY OF has 15 EPA violation(s) on record, with the most recent in 2022. Violation types include Other, MR, MCL. 3 are health-based violations.
How many people does MONTESANO CITY OF serve?
MONTESANO CITY OF serves approximately 5,492 people, Washington.
What type of water does MONTESANO CITY OF provide?
MONTESANO CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5356000.
How does MONTESANO CITY OF compare to other utilities in Washington?
MONTESANO CITY OF scores 62/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Washington state page for a full comparison of water systems.