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States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 083090029

Mission Dam Water System

Pablo, EPA Region 8 — Tribal Water Systems 59855 - drinking water served from groundwater sources to 87 people, tracked in EPA SDWIS and UCMR5.

87
People served
52
EPA violations
29
Health-based
Untested
UCMR5 result

The verdict

EPA records 52 drinking-water violations at Mission Dam Water System, 56% of them health-based.

52
Total EPA violations on record
56%
Health-based (MCL / treatment failure)
87
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mission Dam Water System

Mission Dam Water System is a native american-owned community water system that delivers drinking water to 87 residents in Pablo, EPA Region 8 — Tribal Water Systems through 39 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 52 total violations for this system , of which 29 (56%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 23 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 29 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 8 — 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
87
Total Violations
52
Health-Based Violations
29
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
39
School/Daycare
No
MCL Violations
29
Monitoring Violations
23
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 29 2015
Coliform (TCR) MR 8 2003
Antimony, Total MR 1 2014
Chromium MR 1 2014
Beryllium, Total MR 1 2014
Selenium MR 1 2014
Mercury MR 1 2014
Barium MR 1 2014
Arsenic MR 1 2014
Lead and Copper Rule MR 1 2023
Chlorine MR 1 2024
Cadmium MR 1 2014
Thallium, Total MR 1 2014
Gross Alpha, Excl. Radon and U MR 1 1976
CYANIDE MR 1 2014
Nickel MR 1 2014
Combined Radium (-226 and -228) MR 1 1976

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 Mission Dam Water System.

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 083090029 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 8 — Tribal Water Systems Drinking Water Authority

EPA Region 8 — 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 08 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
2024 Chlorine MR 1 SDWIS / 083090029 / 0999
2023 Lead and Copper Rule MR 1 SDWIS / 083090029 / 5000
2015 Coliform (TCR) MCL 29 SDWIS / 083090029 / 3100
2014 Antimony, Total MR 1 SDWIS / 083090029 / 1074
2014 Chromium MR 1 SDWIS / 083090029 / 1020
2014 Beryllium, Total MR 1 SDWIS / 083090029 / 1075
2014 Selenium MR 1 SDWIS / 083090029 / 1045
2014 Mercury MR 1 SDWIS / 083090029 / 1035
2014 Barium MR 1 SDWIS / 083090029 / 1010
2014 Arsenic MR 1 SDWIS / 083090029 / 1005
2014 Cadmium MR 1 SDWIS / 083090029 / 1015
2014 Thallium, Total MR 1 SDWIS / 083090029 / 1085
2014 CYANIDE MR 1 SDWIS / 083090029 / 1024
2014 Nickel MR 1 SDWIS / 083090029 / 1036
2003 Coliform (TCR) MR 8 SDWIS / 083090029 / 3100

How Mission Dam Water System Compares

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

Metric Mission Dam Water System EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 52 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 29 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 87 - 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 8 — 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 Mission Dam Water System water safe to drink? ▼
Mission Dam Water System (PWS ID: 083090029) has 52 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 87 people using Groundwater sources.
How many people does Mission Dam Water System serve? ▼
Mission Dam Water System serves 87 people in Pablo, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 39 service connections.
What type of violations does Mission Dam Water System have? ▼
Mission Dam Water System has 52 total violations: 29 health-based violations (MCL exceedances or treatment failures), 23 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mission Dam Water System water? ▼
No PFAS testing data is available for Mission Dam Water System under the EPA's UCMR5 monitoring program.
What water source does Mission Dam Water System use? ▼
Mission Dam Water System 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.