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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090605015

Round Valley Piner

Covelo, EPA Region 9 — Tribal Water Systems 95428 - drinking water served from groundwater sources to 409 people, tracked in EPA SDWIS and UCMR5.

409
People served
455
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 455 drinking-water violations at Round Valley Piner, 1% of them health-based.

455
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
409
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Round Valley Piner

Round Valley Piner is a native american-owned community water system that delivers drinking water to 409 residents in Covelo, EPA Region 9 — Tribal Water Systems through 115 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 455 total violations for this system , of which 5 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 287 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 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 9 — 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
409
Total Violations
455
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
115
School/Daycare
No
MCL Violations
3
Monitoring Violations
287
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 22 2014
Gross Alpha, Excl. Radon and U MR 15 2011
Combined Uranium MR 14 2011
Combined Radium (-226 and -228) MR 14 2011
Revised Total Coliform Rule RPT 13 2023
Nitrate MR 12 2023
Lead and Copper Rule MR 10 2020
Consumer Confidence Rule Other 5 2010
BHC-GAMMA MR 4 2020
Carbofuran MR 4 2020
Atrazine MR 4 2020
LASSO MR 4 2020
2,4-D MR 4 2020
2,4,5-TP MR 4 2020
Pentachlorophenol MR 4 2020
Total Polychlorinated Biphenyls (PCB) MR 4 2020
1,2-DIBROMO-3-CHLOROPROPANE MR 4 2020
ETHYLENE DIBROMIDE MR 4 2020
Chlorine MR 4 2022
Arsenic MR 3 2008
Barium MR 3 2008
Chromium MR 3 2008
Mercury MR 3 2008
Selenium MR 3 2008
Fluoride MR 3 2008
Antimony, Total MR 3 2008
Thallium, Total MR 3 2008
Toxaphene MR 3 2004
Dalapon MR 3 2020
OXAMYL MR 3 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 Round Valley Piner.

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 090605015 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — 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 09 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
2023 Revised Total Coliform Rule RPT 13 SDWIS / 090605015 / 8000
2023 Nitrate MR 12 SDWIS / 090605015 / 1040
2022 Chlorine MR 4 SDWIS / 090605015 / 0999
2022 Revised Total Coliform Rule MON 3 SDWIS / 090605015 / 8000
2022 Public Notice Other 3 SDWIS / 090605015 / 7500
2022 Groundwater Rule TT 2 SDWIS / 090605015 / 0700
2022 E. COLI MR 1 SDWIS / 090605015 / 3014
2020 Lead and Copper Rule MR 10 SDWIS / 090605015 / 5000
2020 BHC-GAMMA MR 4 SDWIS / 090605015 / 2010
2020 Carbofuran MR 4 SDWIS / 090605015 / 2046
2020 Atrazine MR 4 SDWIS / 090605015 / 2050
2020 LASSO MR 4 SDWIS / 090605015 / 2051
2020 2,4-D MR 4 SDWIS / 090605015 / 2105
2020 2,4,5-TP MR 4 SDWIS / 090605015 / 2110
2020 Pentachlorophenol MR 4 SDWIS / 090605015 / 2326

How Round Valley Piner Compares

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

Metric Round Valley Piner EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 455 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 409 - 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 9 — 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 Round Valley Piner water safe to drink? ▼
Round Valley Piner (PWS ID: 090605015) has 455 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 409 people using Groundwater sources.
How many people does Round Valley Piner serve? ▼
Round Valley Piner serves 409 people in Covelo, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 115 service connections.
What type of violations does Round Valley Piner have? ▼
Round Valley Piner has 455 total violations: 5 health-based violations (MCL exceedances or treatment failures), 287 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Round Valley Piner water? ▼
No PFAS testing data is available for Round Valley Piner under the EPA's UCMR5 monitoring program.
What water source does Round Valley Piner use? ▼
Round Valley Piner 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.