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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090605125

Bear River/Singley Hill

Loleta, EPA Region 9 — Tribal Water Systems 95551 - drinking water served from groundwater sources to 1,530 people, tracked in EPA SDWIS and UCMR5.

1,530
People served
181
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 181 drinking-water violations at Bear River/Singley Hill, 1% of them health-based.

181
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
1,530
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Bear River/Singley Hill

Bear River/Singley Hill is a native american-owned community water system that delivers drinking water to 1,530 residents in Loleta, EPA Region 9 — Tribal Water Systems through 13 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 181 total violations for this system , of which 1 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 59 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 12 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
1,530
Total Violations
181
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
13
School/Daycare
No
MCL Violations
1
Monitoring Violations
59
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 12 2009
Nitrate MR 5 2024
Chlorine MR 4 2025
Lead and Copper Rule MR 4 2024
TTHM MR 2 2021
Total Haloacetic Acids (HAA5) MR 2 2021
Endrin MR 1 2001
Methoxychlor MR 1 2001
Toxaphene MR 1 2001
Diquat MR 1 2001
Endothall MR 1 2001
Di(2-ethylhexyl) phthalate MR 1 2001
Dinoseb MR 1 2001
Hexachlorocyclopentadiene MR 1 2001
Carbofuran MR 1 2001
Atrazine MR 1 2001
LASSO MR 1 2001
Heptachlor epoxide MR 1 2001
HEXACHLOROBENZENE MR 1 2001
Benzo(a)pyrene MR 1 2001
Pentachlorophenol MR 1 2001
Total Polychlorinated Biphenyls (PCB) MR 1 2001
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2001
Chlordane MR 1 2001
Bromate MR 1 2024
Simazine MR 1 2001
OXAMYL MR 1 2001
Consumer Confidence Rule Other 1 2000
Di(2-ethylhexyl) adipate MR 1 2001
Heptachlor MR 1 2001

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 Bear River/Singley Hill.

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 090605125 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
2025 Chlorine MR 4 SDWIS / 090605125 / 0999
2024 Nitrate MR 5 SDWIS / 090605125 / 1040
2024 Lead and Copper Rule MR 4 SDWIS / 090605125 / 5000
2024 Bromate MR 1 SDWIS / 090605125 / 1011
2021 TTHM MR 2 SDWIS / 090605125 / 2950
2021 Total Haloacetic Acids (HAA5) MR 2 SDWIS / 090605125 / 2456
2009 Coliform (TCR) MR 12 SDWIS / 090605125 / 3100
2007 Coliform (TCR) MCL 1 SDWIS / 090605125 / 3100
2001 Endrin MR 1 SDWIS / 090605125 / 2005
2001 Methoxychlor MR 1 SDWIS / 090605125 / 2015
2001 Toxaphene MR 1 SDWIS / 090605125 / 2020
2001 Diquat MR 1 SDWIS / 090605125 / 2032
2001 Endothall MR 1 SDWIS / 090605125 / 2033
2001 Di(2-ethylhexyl) phthalate MR 1 SDWIS / 090605125 / 2039
2001 Dinoseb MR 1 SDWIS / 090605125 / 2041

How Bear River/Singley Hill Compares

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

Metric Bear River/Singley Hill EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 181 - 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 1,530 - 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 Bear River/Singley Hill water safe to drink? ▼
Bear River/Singley Hill (PWS ID: 090605125) has 181 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,530 people using Groundwater sources.
How many people does Bear River/Singley Hill serve? ▼
Bear River/Singley Hill serves 1,530 people in Loleta, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 13 service connections.
What type of violations does Bear River/Singley Hill have? ▼
Bear River/Singley Hill has 181 total violations: 1 health-based violations (MCL exceedances or treatment failures), 59 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Bear River/Singley Hill water? ▼
No PFAS testing data is available for Bear River/Singley Hill under the EPA's UCMR5 monitoring program.
What water source does Bear River/Singley Hill use? ▼
Bear River/Singley Hill 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.