D23/100
COLUMBIA CITY MUN WATERWORKS — Water Quality Report 2026
Serving 1,995 people · Oregon
Water Source
Groundwater
County
—
System ID
OR4100203
Violations
57
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.50 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Consumer confidence report — inadequate or unavailable
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2025 – March 10, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – July 8, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – August 15, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved
Consumer confidence report — inadequate or unavailable
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – April 5, 2022Rule: Ground Water RuleEnforcement: 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 COLUMBIA CITY MUN WATERWORKS
Is COLUMBIA CITY MUN WATERWORKS water safe to drink?
COLUMBIA CITY MUN WATERWORKS water receives a grade of D (23/100), which is considered poor. 1 contaminant(s) exceed EPA legal limits and 57 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has COLUMBIA CITY MUN WATERWORKS detected?
2 contaminants were tested in COLUMBIA CITY MUN WATERWORKS's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does COLUMBIA CITY MUN WATERWORKS have any EPA violations?
Yes, COLUMBIA CITY MUN WATERWORKS has 57 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other, TT. 3 are health-based violations.
How many people does COLUMBIA CITY MUN WATERWORKS serve?
COLUMBIA CITY MUN WATERWORKS serves approximately 1,995 people, Oregon.
What type of water does COLUMBIA CITY MUN WATERWORKS provide?
COLUMBIA CITY MUN WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is OR4100203.
How does COLUMBIA CITY MUN WATERWORKS compare to other utilities in Oregon?
COLUMBIA CITY MUN WATERWORKS scores 23/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Oregon state page for a full comparison of water systems.