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Community Water System · PWS TX1600001

City of Mason

Mason, Texas 76856-0068 - drinking water served from groundwater sources to 2,228 people, tracked in EPA SDWIS and UCMR5.

2,228
People served
665
EPA violations
593
Health-based
Untested
UCMR5 result

The verdict

EPA records 665 drinking-water violations at City of Mason, 89% of them health-based - above the Texas per-system average.

665
Total EPA violations on record
89%
Health-based (MCL / treatment failure)
2,228
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: City of Mason

City of Mason is a local-owned community water system that delivers drinking water to 2,228 residents in Mason, Texas (Mason County) through 1,327 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 665 total violations for this system , of which 593 (89%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 29 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 Combined Radium (-226 and -228), recorded in 337 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.

Across Texas, EPA tracks 7,351 public water systems serving 33,253,313 people, with 746,210 cumulative violations and 162,945 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 101.5 violations. Statewide, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%).

City of Mason's 665 violations sit above the Texas average.

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
2,228
Total Violations
665
Health-Based Violations
593
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,327
County
Mason
School/Daycare
No
MCL Violations
593
Monitoring Violations
29
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 337 2021
Gross Alpha, Excl. Radon and U MCL 256 2022
Public Notice Other 38 2020
Revised Total Coliform Rule MON 12 2019
Coliform (TCR) MR 8 2014
Lead and Copper Rule MR 6 2022
E. COLI MR 3 2024
Coliform (TCR) Other 1 1992

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 City of Mason.

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 TX1600001 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Texas Drinking Water Authority

Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch is the primacy agency that licenses and inspects City of Mason under EPA-delegated authority.

Open TX regulator portal

Source: Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch

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 E. COLI MR 3 SDWIS / TX1600001 / 3014
2022 Gross Alpha, Excl. Radon and U MCL 256 SDWIS / TX1600001 / 4000
2022 Lead and Copper Rule MR 6 SDWIS / TX1600001 / 5000
2021 Combined Radium (-226 and -228) MCL 337 SDWIS / TX1600001 / 4010
2020 Public Notice Other 38 SDWIS / TX1600001 / 7500
2019 Revised Total Coliform Rule MON 12 SDWIS / TX1600001 / 8000
2014 Coliform (TCR) MR 8 SDWIS / TX1600001 / 3100
1992 Coliform (TCR) Other 1 SDWIS / TX1600001 / 3100

How City of Mason Compares

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

Metric City of Mason Texas avg Federal benchmark
Total violations 665 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 593 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 93.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,228 4,524 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,351 regulated public water systems in Texas.

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 City of Mason water safe to drink? ▼
City of Mason (PWS ID: TX1600001) has 665 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,228 people using Groundwater sources.
How many people does City of Mason serve? ▼
City of Mason serves 2,228 people in Mason, Texas. It is a Local-owned system using Groundwater water sources with 1,327 service connections.
What type of violations does City of Mason have? ▼
City of Mason has 665 total violations: 593 health-based violations (MCL exceedances or treatment failures), 29 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in City of Mason water? ▼
No PFAS testing data is available for City of Mason under the EPA's UCMR5 monitoring program.
What water source does City of Mason use? ▼
City of Mason 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.