TapSafetyReport
B61/100

CORNELIUS, CITY OF — Water Quality Report 2026

Serving 14,490 people · Oregon

Water Source
Purchased Surface Water
County
—
System ID
OR4100218
Violations
39

Contaminant Test Results

EPA Violation History

5

Violations (last 5yr)

1

Unresolved

0

Health-Related

TIER 3Unresolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Rule: Consumer Confidence RuleVerify on EPA.gov
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2023 – July 20, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2022 – September 30, 2022Rule: Revised Total Coliform RuleEnforcement: 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: July 1, 2022 – September 30, 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: July 1, 2022 – September 30, 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 CORNELIUS, CITY OF

Is CORNELIUS, CITY OF water safe to drink?

CORNELIUS, CITY OF water receives a grade of B (61/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.

What contaminants has CORNELIUS, CITY OF detected?

69 contaminants were tested in CORNELIUS, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.

Does CORNELIUS, CITY OF have any EPA violations?

Yes, CORNELIUS, CITY OF has 39 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, MON.

How many people does CORNELIUS, CITY OF serve?

CORNELIUS, CITY OF serves approximately 14,490 people, Oregon.

What type of water does CORNELIUS, CITY OF provide?

CORNELIUS, CITY OF sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is OR4100218.

How does CORNELIUS, CITY OF compare to other utilities in Oregon?

CORNELIUS, CITY OF scores 61/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Oregon state page for a full comparison of water systems.