B72/100
Coos Bay Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 34,500 residents · Oregon
What's In Coos Bay's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
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
Water Utility Details
COOS BAY NORTH BEND WTR BRD
Population Served
34,500
Water Source
Surface Water
System ID
OR4100205
Frequently Asked Questions About Coos Bay Water
Is Coos Bay tap water safe to drink?
Coos Bay, Oregon tap water receives a grade of B (72/100), which is considered good. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Coos Bay's water?
Of the 69 contaminants tested in Coos Bay's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Coos Bay have any water quality violations?
Yes, Coos Bay has 13 EPA violation(s) on record, with the most recent in 2015. Violation types include MR, TT, MCL. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Coos Bay?
Coos Bay water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Coos Bay's tap water come from?
Coos Bay's drinking water is sourced from surface water and supplied by COOS BAY NORTH BEND WTR BRD. The system serves approximately 34,500 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Coos Bay's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Coos Bay's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Coos Bay's water compare to other cities in Oregon?
Coos Bay's water quality score of 72/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Oregon state page to see how all cities in the state compare.
What should I do if I'm concerned about Coos Bay's water quality?
If you have concerns about Coos Bay's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (COOS BAY NORTH BEND WTR BRD) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.