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Non-Transient Non-Community Water System · PWS WA53AB974

Coulee Flats Dairy

Yakima, Washington 98908 - drinking water served from groundwater sources to 83 people, tracked in EPA SDWIS and UCMR5.

83
People served
86
EPA violations
7
Health-based
Untested
UCMR5 result

The verdict

EPA records 86 drinking-water violations at Coulee Flats Dairy, 8% of them health-based - above the Washington per-system average.

86
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
83
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coulee Flats Dairy

Coulee Flats Dairy is a private-owned non-transient non-community water system that delivers drinking water to 83 residents in Yakima, Washington (Franklin County) through 4 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 86 total violations for this system , of which 7 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 79 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 Coliform (TCR), recorded in 7 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%).

Coulee Flats Dairy's 86 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
83
Total Violations
86
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
4
County
Franklin
School/Daycare
No
MCL Violations
6
Monitoring Violations
79
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 7 2014
Nitrate MCL 6 2025
Nitrate MR 5 2023
o-Dichlorobenzene MR 2 2010
p-Dichlorobenzene MR 2 2010
1,1-Dichloroethylene MR 2 2010
trans-1,2-Dichloroethylene MR 2 2010
1,2-Dichloroethane MR 2 2010
1,1,1-Trichloroethane MR 2 2010
1,2-Dichloropropane MR 2 2010
Trichloroethylene MR 2 2010
1,1,2-Trichloroethane MR 2 2010
Benzene MR 2 2010
Toluene MR 2 2010
Styrene MR 2 2010
1,2,4-Trichlorobenzene MR 2 2010
Carbon tetrachloride MR 2 2010
Ethylbenzene MR 2 2010
Arsenic MR 2 2017
Barium MR 2 2017
CYANIDE MR 2 2017
Fluoride MR 2 2017
Mercury MR 2 2017
Antimony, Total MR 2 2017
Beryllium, Total MR 2 2017
Thallium, Total MR 2 2017
Cadmium MR 2 2017
Nickel MR 2 2017
Nitrite MR 2 2017
DICHLOROMETHANE MR 2 2010

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 Coulee Flats Dairy.

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 WA53AB974 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 Coulee Flats Dairy 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 Nitrate MCL 6 SDWIS / WA53AB974 / 1040
2023 Nitrate MR 5 SDWIS / WA53AB974 / 1040
2018 Revised Total Coliform Rule TT 1 SDWIS / WA53AB974 / 8000
2017 Arsenic MR 2 SDWIS / WA53AB974 / 1005
2017 Barium MR 2 SDWIS / WA53AB974 / 1010
2017 CYANIDE MR 2 SDWIS / WA53AB974 / 1024
2017 Fluoride MR 2 SDWIS / WA53AB974 / 1025
2017 Mercury MR 2 SDWIS / WA53AB974 / 1035
2017 Antimony, Total MR 2 SDWIS / WA53AB974 / 1074
2017 Beryllium, Total MR 2 SDWIS / WA53AB974 / 1075
2017 Thallium, Total MR 2 SDWIS / WA53AB974 / 1085
2017 Cadmium MR 2 SDWIS / WA53AB974 / 1015
2017 Nickel MR 2 SDWIS / WA53AB974 / 1036
2017 Nitrite MR 2 SDWIS / WA53AB974 / 1041
2017 Selenium MR 2 SDWIS / WA53AB974 / 1045

How Coulee Flats Dairy Compares

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

Metric Coulee Flats Dairy Washington avg Federal benchmark
Total violations 86 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 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 83 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 Coulee Flats Dairy water safe to drink? ▼
Coulee Flats Dairy (PWS ID: WA53AB974) has 86 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 83 people using Groundwater sources.
How many people does Coulee Flats Dairy serve? ▼
Coulee Flats Dairy serves 83 people in Yakima, Washington. It is a Private-owned system using Groundwater water sources with 4 service connections.
What type of violations does Coulee Flats Dairy have? ▼
Coulee Flats Dairy has 86 total violations: 7 health-based violations (MCL exceedances or treatment failures), 79 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coulee Flats Dairy water? ▼
No PFAS testing data is available for Coulee Flats Dairy under the EPA's UCMR5 monitoring program.
What water source does Coulee Flats Dairy use? ▼
Coulee Flats Dairy uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.