F0/100
BLACK DIAMOND WATER DEPT — Water Quality Report 2026
Serving 2,420 people · Washington
Water Source
Groundwater
County
—
System ID
WA5307220
Violations
164
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.70 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
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
Frequently Asked Questions About BLACK DIAMOND WATER DEPT
Is BLACK DIAMOND WATER DEPT water safe to drink?
BLACK DIAMOND WATER DEPT water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 164 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has BLACK DIAMOND WATER DEPT detected?
2 contaminants were tested in BLACK DIAMOND WATER DEPT's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does BLACK DIAMOND WATER DEPT have any EPA violations?
Yes, BLACK DIAMOND WATER DEPT has 164 EPA violation(s) on record, with the most recent in 2017. Violation types include Other, MR, MCL. 6 are health-based violations.
How many people does BLACK DIAMOND WATER DEPT serve?
BLACK DIAMOND WATER DEPT serves approximately 2,420 people, Washington.
What type of water does BLACK DIAMOND WATER DEPT provide?
BLACK DIAMOND WATER DEPT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5307220.
How does BLACK DIAMOND WATER DEPT compare to other utilities in Washington?
BLACK DIAMOND WATER DEPT scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Washington state page for a full comparison of water systems.