C57/100
Union Gap Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 6,433 residents · Washington
What's In Union Gap's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2017.
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
UNION GAP WATER
Population Served
6,433
Water Source
Groundwater
System ID
WA5390250
Frequently Asked Questions About Union Gap Water
Is Union Gap tap water safe to drink?
Union Gap, Washington tap water receives a grade of C (57/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 23 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Union Gap's water?
31 contaminants were tested in Union Gap's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Union Gap have any water quality violations?
Yes, Union Gap has 23 EPA violation(s) on record, with the most recent in 2017. Violation types include MON, MR, MCL. 5 of these are health-based violations, which are the most serious category.
Do I need a water filter in Union Gap?
Union Gap 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. All contaminants are within health goals.
Where does Union Gap's tap water come from?
Union Gap's drinking water is sourced from groundwater and supplied by UNION GAP WATER. The system serves approximately 6,433 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Union Gap'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. Union Gap'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 Union Gap's water compare to other cities in Washington?
Union Gap's water quality score of 57/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Washington state page to see how all cities in the state compare.
What should I do if I'm concerned about Union Gap's water quality?
If you have concerns about Union Gap'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 (UNION GAP WATER) 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.