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Community Water System · PWS WA5307221

Black Diamond Water District

Port Angeles, Washington 98362 - drinking water served from surface water sources to 452 people, tracked in EPA SDWIS and UCMR5.

452
People served
98
EPA violations
10
Health-based
Untested
UCMR5 result

The verdict

EPA records 98 drinking-water violations at Black Diamond Water District, 10% of them health-based - above the Washington per-system average.

98
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
452
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Black Diamond Water District

Black Diamond Water District is a local-owned community water system that delivers drinking water to 452 residents in Port Angeles, Washington (Clallam County) through 231 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 98 total violations for this system , of which 10 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 85 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 20 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Black Diamond Water District's 98 violations sit above the Washington average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
452
Total Violations
98
Health-Based Violations
10
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
231
County
Clallam
School/Daycare
No
MCL Violations
0
Monitoring Violations
85
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 20 2025
Coliform (TCR) MR 12 2000
Surface Water Treatment Rule TT 10 2007
1,2,4-Trichlorobenzene MR 2 2007
o-Dichlorobenzene MR 2 2007
p-Dichlorobenzene MR 2 2007
Vinyl chloride MR 2 2007
Carbon tetrachloride MR 2 2007
CHLOROBENZENE MR 2 2007
Toluene MR 2 2007
Ethylbenzene MR 2 2007
Revised Total Coliform Rule MON 2 2024
cis-1,2-Dichloroethylene MR 2 2007
1,1-Dichloroethylene MR 2 2007
DICHLOROMETHANE MR 2 2007
1,2-Dichloropropane MR 2 2007
Benzene MR 2 2007
1,2-Dichloroethane MR 2 2007
Trichloroethylene MR 2 2007
Styrene MR 2 2007
trans-1,2-Dichloroethylene MR 2 2007
1,1,2-Trichloroethane MR 2 2007
Tetrachloroethylene MR 2 2007
1,1,1-Trichloroethane MR 2 2007
TTHM MR 1 2023
Total Haloacetic Acids (HAA5) MR 1 2023
Nitrate MR 1 1979
Selenium MR 1 1979
Arsenic MR 1 1979
Chromium MR 1 1979

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Black Diamond Water District.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WA5307221 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health, Office of Drinking Water is the primacy agency that licenses and inspects Black Diamond Water District under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health, Office of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Surface Water Treatment Rule MR 20 SDWIS / WA5307221 / 0200
2024 Revised Total Coliform Rule MON 2 SDWIS / WA5307221 / 8000
2023 TTHM MR 1 SDWIS / WA5307221 / 2950
2023 Total Haloacetic Acids (HAA5) MR 1 SDWIS / WA5307221 / 2456
2011 Consumer Confidence Rule Other 1 SDWIS / WA5307221 / 7000
2007 Surface Water Treatment Rule TT 10 SDWIS / WA5307221 / 0200
2007 1,2,4-Trichlorobenzene MR 2 SDWIS / WA5307221 / 2378
2007 o-Dichlorobenzene MR 2 SDWIS / WA5307221 / 2968
2007 p-Dichlorobenzene MR 2 SDWIS / WA5307221 / 2969
2007 Vinyl chloride MR 2 SDWIS / WA5307221 / 2976
2007 Carbon tetrachloride MR 2 SDWIS / WA5307221 / 2982
2007 CHLOROBENZENE MR 2 SDWIS / WA5307221 / 2989
2007 Toluene MR 2 SDWIS / WA5307221 / 2991
2007 Ethylbenzene MR 2 SDWIS / WA5307221 / 2992
2007 cis-1,2-Dichloroethylene MR 2 SDWIS / WA5307221 / 2380

How Black Diamond Water District Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Black Diamond Water District Washington avg Federal benchmark
Total violations 98 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 10 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 452 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Black Diamond Water District water safe to drink? ▼
Black Diamond Water District (PWS ID: WA5307221) has 98 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 452 people using Surface Water sources.
How many people does Black Diamond Water District serve? ▼
Black Diamond Water District serves 452 people in Port Angeles, Washington. It is a Local-owned system using Surface Water water sources with 231 service connections.
What type of violations does Black Diamond Water District have? ▼
Black Diamond Water District has 98 total violations: 10 health-based violations (MCL exceedances or treatment failures), 85 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Black Diamond Water District water? ▼
No PFAS testing data is available for Black Diamond Water District under the EPA's UCMR5 monitoring program.
What water source does Black Diamond Water District use? ▼
Black Diamond Water District uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.