C45/100
PATTISON 500 — Water Quality Report 2026
Serving 4,302 people · Washington
Water Source
Groundwater
County
—
System ID
WA5366578
Violations
36
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2012.
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 PATTISON 500
Is PATTISON 500 water safe to drink?
PATTISON 500 water receives a grade of C (45/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 36 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has PATTISON 500 detected?
31 contaminants were tested in PATTISON 500's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does PATTISON 500 have any EPA violations?
Yes, PATTISON 500 has 36 EPA violation(s) on record, with the most recent in 2012. Violation types include Other, MR, MCL. 4 are health-based violations.
How many people does PATTISON 500 serve?
PATTISON 500 serves approximately 4,302 people, Washington.
What type of water does PATTISON 500 provide?
PATTISON 500 sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5366578.
How does PATTISON 500 compare to other utilities in Washington?
PATTISON 500 scores 45/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Washington state page for a full comparison of water systems.