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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400239

SCUA Cutter

San Carlos, EPA Region 9 — Tribal Water Systems 85550 - drinking water served from groundwater sources to 574 people, tracked in EPA SDWIS and UCMR5.

574
People served
323
EPA violations
32
Health-based
Untested
UCMR5 result

The verdict

EPA records 323 drinking-water violations at SCUA Cutter, 10% of them health-based.

323
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
574
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: SCUA Cutter

SCUA Cutter is a native american-owned community water system that delivers drinking water to 574 residents in San Carlos, EPA Region 9 — Tribal Water Systems through 93 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 323 total violations for this system , of which 32 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 228 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 110 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
574
Total Violations
323
Health-Based Violations
32
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
93
School/Daycare
No
MCL Violations
32
Monitoring Violations
228
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 110 2016
Coliform (TCR) MCL 32 2013
Chlorine MR 23 2025
Gross Alpha, Excl. Radon and U MR 16 2010
Combined Uranium MR 16 2010
Combined Radium (-226 and -228) MR 16 2010
TTHM MR 13 2023
Total Haloacetic Acids (HAA5) MR 12 2023
Lead and Copper Rule MR 12 2010
Consumer Confidence Rule Other 12 2022
Revised Total Coliform Rule RPT 10 2023
Public Notice Other 6 2022
Asbestos MR 4 2002
Revised Total Coliform Rule MON 4 2022
E. COLI MR 2 2012
LEAD AND COPPER RULE REVISIONS RPT 2 2024
Groundwater Rule Other 2 2018

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 SCUA Cutter.

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 090400239 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 23 SDWIS / 090400239 / 0999
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / 090400239 / 5200
2023 TTHM MR 13 SDWIS / 090400239 / 2950
2023 Total Haloacetic Acids (HAA5) MR 12 SDWIS / 090400239 / 2456
2023 Revised Total Coliform Rule RPT 10 SDWIS / 090400239 / 8000
2022 Consumer Confidence Rule Other 12 SDWIS / 090400239 / 7000
2022 Public Notice Other 6 SDWIS / 090400239 / 7500
2022 Revised Total Coliform Rule MON 4 SDWIS / 090400239 / 8000
2018 Groundwater Rule Other 2 SDWIS / 090400239 / 0700
2016 Coliform (TCR) MR 110 SDWIS / 090400239 / 3100
2013 Coliform (TCR) MCL 32 SDWIS / 090400239 / 3100
2012 E. COLI MR 2 SDWIS / 090400239 / 3014
2010 Gross Alpha, Excl. Radon and U MR 16 SDWIS / 090400239 / 4000
2010 Combined Uranium MR 16 SDWIS / 090400239 / 4006
2010 Combined Radium (-226 and -228) MR 16 SDWIS / 090400239 / 4010

How SCUA Cutter Compares

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

Metric SCUA Cutter EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 323 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 32 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 574 - 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 SCUA Cutter water safe to drink? ▼
SCUA Cutter (PWS ID: 090400239) has 323 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 574 people using Groundwater sources.
How many people does SCUA Cutter serve? ▼
SCUA Cutter serves 574 people in San Carlos, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 93 service connections.
What type of violations does SCUA Cutter have? ▼
SCUA Cutter has 323 total violations: 32 health-based violations (MCL exceedances or treatment failures), 228 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SCUA Cutter water? ▼
No PFAS testing data is available for SCUA Cutter under the EPA's UCMR5 monitoring program.
What water source does SCUA Cutter use? ▼
SCUA Cutter 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.