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Community Water System · PWS OR4100370

Black Mountain Water District

Hermiston, Oregon 97838 - drinking water served from groundwater sources to 43 people, tracked in EPA SDWIS and UCMR5.

43
People served
198
EPA violations
29
Health-based
Untested
UCMR5 result

The verdict

EPA records 198 drinking-water violations at Black Mountain Water District, 15% of them health-based - above the Oregon per-system average.

198
Total EPA violations on record
15%
Health-based (MCL / treatment failure)
43
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Black Mountain Water District

Black Mountain Water District is a private-owned community water system that delivers drinking water to 43 residents in Hermiston, Oregon (Morrow County) through 88 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 198 total violations for this system , of which 29 (15%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 162 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 32 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 Oregon, EPA tracks 2,518 public water systems serving 4,005,242 people, with 206,659 cumulative violations and 20,339 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 82.1 violations. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%).

Black Mountain Water District's 198 violations sit above the Oregon 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
43
Total Violations
198
Health-Based Violations
29
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
88
County
Morrow
School/Daycare
No
MCL Violations
29
Monitoring Violations
162
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 32 2015
Coliform (TCR) MCL 29 2015
Nitrate MR 15 2008
Public Notice Other 4 2017
E. COLI MR 4 2017
COLIPHAGE MR 3 2021
Barium MR 2 2017
Chromium MR 2 2017
Fluoride MR 2 2017
Nickel MR 2 2017
Antimony, Total MR 2 2017
Beryllium, Total MR 2 2017
Selenium MR 2 2017
Glyphosate MR 2 2017
Di(2-ethylhexyl) adipate MR 2 2017
2,4-D MR 2 2017
Xylenes, Total MR 2 2017
DICHLOROMETHANE MR 2 2017
o-Dichlorobenzene MR 2 2017
Vinyl chloride MR 2 2017
trans-1,2-Dichloroethylene MR 2 2017
1,2-Dichloroethane MR 2 2017
1,1,1-Trichloroethane MR 2 2017
1,2-Dichloropropane MR 2 2017
Trichloroethylene MR 2 2017
1,1,2-Trichloroethane MR 2 2017
Tetrachloroethylene MR 2 2017
Toluene MR 2 2017
Styrene MR 2 2017
Arsenic MR 2 2017

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 Mountain 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 OR4100370 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oregon Drinking Water Authority

Oregon's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OR regulator via EPA SDWIS

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
2024 Revised Total Coliform Rule MON 2 SDWIS / OR4100370 / 8000
2023 Consumer Confidence Rule Other 1 SDWIS / OR4100370 / 7000
2021 COLIPHAGE MR 3 SDWIS / OR4100370 / 3028
2017 Public Notice Other 4 SDWIS / OR4100370 / 7500
2017 E. COLI MR 4 SDWIS / OR4100370 / 3014
2017 Barium MR 2 SDWIS / OR4100370 / 1010
2017 Chromium MR 2 SDWIS / OR4100370 / 1020
2017 Fluoride MR 2 SDWIS / OR4100370 / 1025
2017 Nickel MR 2 SDWIS / OR4100370 / 1036
2017 Antimony, Total MR 2 SDWIS / OR4100370 / 1074
2017 Beryllium, Total MR 2 SDWIS / OR4100370 / 1075
2017 Selenium MR 2 SDWIS / OR4100370 / 1045
2017 Glyphosate MR 2 SDWIS / OR4100370 / 2034
2017 Di(2-ethylhexyl) adipate MR 2 SDWIS / OR4100370 / 2035
2017 2,4-D MR 2 SDWIS / OR4100370 / 2105

How Black Mountain Water District Compares

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

Metric Black Mountain Water District Oregon avg Federal benchmark
Total violations 198 82.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 29 8.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 24% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 43 1,591 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,518 regulated public water systems in Oregon.

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 Mountain Water District water safe to drink? ▼
Black Mountain Water District (PWS ID: OR4100370) has 198 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 43 people using Groundwater sources.
How many people does Black Mountain Water District serve? ▼
Black Mountain Water District serves 43 people in Hermiston, Oregon. It is a Private-owned system using Groundwater water sources with 88 service connections.
What type of violations does Black Mountain Water District have? ▼
Black Mountain Water District has 198 total violations: 29 health-based violations (MCL exceedances or treatment failures), 162 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Black Mountain Water District water? ▼
No PFAS testing data is available for Black Mountain Water District under the EPA's UCMR5 monitoring program.
What water source does Black Mountain Water District use? ▼
Black Mountain Water District uses Groundwater 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.