B71/100
Dayton Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 3,283 residents · Washington
What's In Dayton's Tap Water?
1
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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
DAYTON WATER DEPARTMENT
Population Served
3,283
Water Source
Groundwater
System ID
WA5318250
Frequently Asked Questions About Dayton Water
Is Dayton tap water safe to drink?
Dayton, Washington tap water receives a grade of B (71/100), which is considered good. Out of 1 contaminants tested, none exceed EPA maximum contaminant levels (MCLs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Dayton's water?
1 contaminants were tested in Dayton's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Dayton have any water quality violations?
Yes, Dayton has 13 EPA violation(s) on record, with the most recent in 2018. Violation types include Other, MR, MCL. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in Dayton?
Dayton 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 Dayton's tap water come from?
Dayton's drinking water is sourced from groundwater and supplied by DAYTON WATER DEPARTMENT. The system serves approximately 3,283 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Dayton'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. Dayton'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 Dayton's water compare to other cities in Washington?
Dayton's water quality score of 71/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Washington state page to see how all cities in the state compare.
What should I do if I'm concerned about Dayton's water quality?
If you have concerns about Dayton'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 (DAYTON WATER DEPARTMENT) 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.