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Community Water System · PWS 105338102

Parker

Toppenish, EPA Region 10 — Tribal Water Systems 98948 - drinking water served from groundwater sources to 300 people, tracked in EPA SDWIS and UCMR5.

300
People served
249
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 249 drinking-water violations at Parker.

249
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
300
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Parker

Parker is a native american-owned community water system that delivers drinking water to 300 residents in Toppenish, EPA Region 10 — Tribal Water Systems through 84 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 249 total violations for this system , of which 1 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 237 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 Lead and Copper Rule, 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.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

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
300
Total Violations
249
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
84
School/Daycare
No
MCL Violations
1
Monitoring Violations
237
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 7 2017
Consumer Confidence Rule Other 7 2019
Gross Alpha, Excl. Radon and U MR 6 2017
2,3,7,8-TCDD MR 6 2017
Combined Uranium MR 6 2017
Combined Radium (-226 and -228) MR 5 2017
Endrin MR 4 2013
Methoxychlor MR 4 2013
Toxaphene MR 4 2013
Dalapon MR 4 2013
Endothall MR 4 2013
Glyphosate MR 4 2013
Di(2-ethylhexyl) adipate MR 4 2013
OXAMYL MR 4 2013
Di(2-ethylhexyl) phthalate MR 4 2013
Carbofuran MR 4 2013
LASSO MR 4 2013
Heptachlor MR 4 2013
2,4,5-TP MR 4 2013
HEXACHLOROBENZENE MR 4 2013
1,2-DIBROMO-3-CHLOROPROPANE MR 4 2013
Chlordane MR 4 2013
Diquat MR 4 2013
Simazine MR 4 2013
Picloram MR 4 2013
Benzo(a)pyrene MR 4 2013
Pentachlorophenol MR 4 2013
Total Polychlorinated Biphenyls (PCB) MR 4 2013
TTHM MR 4 2020
Total Haloacetic Acids (HAA5) MR 4 2020

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 Parker.

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 105338102 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems'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 10 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
2025 Revised Total Coliform Rule RPT 4 SDWIS / 105338102 / 8000
2025 Chlorine MR 2 SDWIS / 105338102 / 0999
2020 TTHM MR 4 SDWIS / 105338102 / 2950
2020 Total Haloacetic Acids (HAA5) MR 4 SDWIS / 105338102 / 2456
2019 Consumer Confidence Rule Other 7 SDWIS / 105338102 / 7000
2019 Nitrate MR 2 SDWIS / 105338102 / 1040
2019 Revised Total Coliform Rule MON 1 SDWIS / 105338102 / 8000
2018 TTHM MCL 1 SDWIS / 105338102 / 2950
2017 Lead and Copper Rule MR 7 SDWIS / 105338102 / 5000
2017 Gross Alpha, Excl. Radon and U MR 6 SDWIS / 105338102 / 4000
2017 2,3,7,8-TCDD MR 6 SDWIS / 105338102 / 2063
2017 Combined Uranium MR 6 SDWIS / 105338102 / 4006
2017 Combined Radium (-226 and -228) MR 5 SDWIS / 105338102 / 4010
2014 Arsenic MR 1 SDWIS / 105338102 / 1005
2014 Cadmium MR 1 SDWIS / 105338102 / 1015

How Parker Compares

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

Metric Parker EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 249 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 300 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 10 — Tribal Water Systems.

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 Parker water safe to drink? ▼
Parker (PWS ID: 105338102) has 249 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 300 people using Groundwater sources.
How many people does Parker serve? ▼
Parker serves 300 people in Toppenish, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 84 service connections.
What type of violations does Parker have? ▼
Parker has 249 total violations: 1 health-based violations (MCL exceedances or treatment failures), 237 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Parker water? ▼
No PFAS testing data is available for Parker under the EPA's UCMR5 monitoring program.
What water source does Parker use? ▼
Parker 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.