B64/100
Hillsboro Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 94,260 residents · Oregon
What's In Hillsboro's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – July 8, 2025Enforcement: 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
Water Utility Details
HILLSBORO-CHERRY GROVE
Population Served
1,628
Water Source
Surface Water
System ID
OR4100985
HILLSBORO, CITY OF
Population Served
92,632
Water Source
Purchased Surface Water
System ID
OR4101513
Frequently Asked Questions About Hillsboro Water
Is Hillsboro tap water safe to drink?
Hillsboro, Oregon tap water receives a grade of B (64/100), 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 Hillsboro's water?
Of the 69 contaminants tested in Hillsboro'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 Hillsboro have any water quality violations?
Yes, Hillsboro has 52 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MON. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in Hillsboro?
Hillsboro 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 Hillsboro's tap water come from?
Hillsboro's drinking water is sourced from surface water and supplied by HILLSBORO-CHERRY GROVE and 1 other water system(s). The system serves approximately 94,260 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Hillsboro'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. Hillsboro'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 Hillsboro's water compare to other cities in Oregon?
Hillsboro's water quality score of 64/100 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 Hillsboro's water quality?
If you have concerns about Hillsboro'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 (HILLSBORO-CHERRY GROVE) 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.