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CITY OF DENISON

PWS ID: TX0910003 · DENISON, Texas 75020-3125

CITY OF DENISON serves 27,500 people in DENISON, Texas using Surface Water water sources. It has 67 recorded EPA violations, including 16 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: CITY OF DENISON

CITY OF DENISON is a local-owned community water system that delivers drinking water to 27,500 residents in DENISON, Texas (Grayson County) through 17,626 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 67 total violations for this system , of which 16 (24%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 32 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Public Notice, recorded in 14 violations (Other). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 20.1 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. CITY OF DENISON's 67 violations sit below the Texas average. Statewide, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
27,500
Total Violations
67
Health-Based Violations
16
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
17,626
County
Grayson
School/Daycare
No
MCL Violations
10
Monitoring Violations
32
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Public Notice Other 14 2021
E. COLI MR 12 2012
Coliform (TCR) MCL 10 2014
Revised Total Coliform Rule MON 8 2023
Interim Enhanced Surface Water Treatment Rule TT 6 2013
Lead and Copper Rule MR 6 2015
CARBON, TOTAL MR 3 2019
Surface Water Treatment Rule MR 2 1993
Interim Enhanced Surface Water Treatment Rule MR 1 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 8/6/2024 12.0000 µg/L 9 µg/L Detected
8:2 FTS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 8/6/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFPeS 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 8/6/2024 <0.006 µg/L 0.006 µg/L Not Detected
4:2 FTS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/6/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFPeA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 8/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/6/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFUnA 8/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
NEtFOSAA 5/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 5/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 5/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 5/7/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFDA 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 5/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 5/7/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFUnA 5/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHpS 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/7/2024 <0.004 µg/L 0.004 µg/L Not Detected

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 DENISON.

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 TX0910003 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 DENISON 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
2023 Revised Total Coliform Rule MON 8 SDWIS / TX0910003 / 8000
2021 Public Notice Other 14 SDWIS / TX0910003 / 7500
2019 CARBON, TOTAL MR 3 SDWIS / TX0910003 / 2920
2015 Lead and Copper Rule MR 6 SDWIS / TX0910003 / 5000
2014 Coliform (TCR) MCL 10 SDWIS / TX0910003 / 3100
2013 Interim Enhanced Surface Water Treatment Rule TT 6 SDWIS / TX0910003 / 0300
2012 E. COLI MR 12 SDWIS / TX0910003 / 3014
2005 Interim Enhanced Surface Water Treatment Rule MR 1 SDWIS / TX0910003 / 0300
1993 Surface Water Treatment Rule MR 2 SDWIS / TX0910003 / 0200

How CITY OF DENISON Compares

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

Metric CITY OF DENISON Texas avg Federal benchmark
Total violations 67 101.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 16 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 93.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 27,500 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is CITY OF DENISON water safe to drink? ▼
CITY OF DENISON (PWS ID: TX0910003) has 67 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 27,500 people using Surface Water sources.
How many people does CITY OF DENISON serve? ▼
CITY OF DENISON serves 27,500 people in DENISON, Texas. It is a Local-owned system using Surface Water water sources with 17,626 service connections.
What type of violations does CITY OF DENISON have? ▼
CITY OF DENISON has 67 total violations: 16 health-based violations (MCL exceedances or treatment failures), 32 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in CITY OF DENISON water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in CITY OF DENISON's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does CITY OF DENISON use? ▼
CITY OF DENISON uses Surface Water 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial