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Yomba Indian Reservation

PWS ID: 093200172 · Austin, 09 89310

Yomba Indian Reservation serves 30 people in Austin, 09 using Groundwater water sources. It has 252 recorded EPA violations, including 9 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: Yomba Indian Reservation

Yomba Indian Reservation is a native american-owned community water system that delivers drinking water to 30 residents in Austin, 09 through 17 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 252 total violations for this system , of which 9 (4%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 180 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 Revised Total Coliform Rule, recorded in 60 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across 09, EPA tracks 323 public water systems serving 555,721 people, with 48,296 cumulative violations and 3,354 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 149.5 violations. Yomba Indian Reservation's 252 violations sit above the 09 average. Statewide, 30 of 41 UCMR5-tested systems have reported PFAS detections (73.2%). 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
30
Total Violations
252
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
17
School/Daycare
No
MCL Violations
5
Monitoring Violations
180
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 60 2025
Public Notice Other 51 2025
Consumer Confidence Rule Other 10 2024
Nitrate MR 8 2024
Coliform (TCR) MCL 5 2015
Coliform (TCR) MR 4 2015
Xylenes, Total MR 3 2020
o-Dichlorobenzene MR 3 2020
E. COLI MR 3 2022
p-Dichlorobenzene MR 3 2020
Groundwater Rule TT 3 2023
cis-1,2-Dichloroethylene MR 2 2020
DICHLOROMETHANE MR 2 2020
Vinyl chloride MR 2 2020
1,1,1-Trichloroethane MR 2 2020
1,1-Dichloroethylene MR 2 2020
Carbon tetrachloride MR 2 2020
Trichloroethylene MR 2 2020
Tetrachloroethylene MR 2 2020
CHLOROBENZENE MR 2 2020
Toluene MR 2 2020
Ethylbenzene MR 2 2020
Styrene MR 2 2020
Gross Alpha, Excl. Radon and U MR 2 2017
Combined Uranium MR 2 2017
Combined Radium (-226 and -228) MR 2 2017
CYANIDE MR 2 2020
Fluoride MR 2 2020
Arsenic MR 2 2020
1,2-Dichloroethane MR 2 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 Yomba Indian Reservation.

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 093200172 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

09 Drinking Water Authority

09'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 Revised Total Coliform Rule MON 60 SDWIS / 093200172 / 8000
2025 Public Notice Other 51 SDWIS / 093200172 / 7500
2024 Consumer Confidence Rule Other 10 SDWIS / 093200172 / 7000
2024 Nitrate MR 8 SDWIS / 093200172 / 1040
2024 Revised Total Coliform Rule RPT 1 SDWIS / 093200172 / 8000
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / 093200172 / 5200
2023 Groundwater Rule TT 3 SDWIS / 093200172 / 0700
2022 E. COLI MR 3 SDWIS / 093200172 / 3014
2021 Revised Total Coliform Rule TT 1 SDWIS / 093200172 / 8000
2020 Xylenes, Total MR 3 SDWIS / 093200172 / 2955
2020 o-Dichlorobenzene MR 3 SDWIS / 093200172 / 2968
2020 p-Dichlorobenzene MR 3 SDWIS / 093200172 / 2969
2020 cis-1,2-Dichloroethylene MR 2 SDWIS / 093200172 / 2380
2020 DICHLOROMETHANE MR 2 SDWIS / 093200172 / 2964
2020 Vinyl chloride MR 2 SDWIS / 093200172 / 2976

How Yomba Indian Reservation Compares

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

Metric Yomba Indian Reservation 09 avg Federal benchmark
Total violations 252 149.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 9 10.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 73.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 30 1,720 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 323 regulated public water systems in 09.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Yomba Indian Reservation water safe to drink? ▼
Yomba Indian Reservation (PWS ID: 093200172) has 252 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 30 people using Groundwater sources.
How many people does Yomba Indian Reservation serve? ▼
Yomba Indian Reservation serves 30 people in Austin, 09. It is a Native American-owned system using Groundwater water sources with 17 service connections.
What type of violations does Yomba Indian Reservation have? ▼
Yomba Indian Reservation has 252 total violations: 9 health-based violations (MCL exceedances or treatment failures), 180 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Yomba Indian Reservation water? ▼
No PFAS testing data is available for Yomba Indian Reservation under the EPA's UCMR5 monitoring program.
What water source does Yomba Indian Reservation use? ▼
Yomba Indian Reservation 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.

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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.

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