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Community Water System · PWS TX0610068

Knob Hill Water System Denton

Little Elm, Texas 75068-6673 - drinking water served from groundwater sources to 234 people, tracked in EPA SDWIS and UCMR5.

234
People served
35
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 35 drinking-water violations at Knob Hill Water System Denton, 6% of them health-based - below the Texas per-system average.

35
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
234
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Knob Hill Water System Denton

Knob Hill Water System Denton is a private-owned community water system that delivers drinking water to 234 residents in Little Elm, Texas (Denton County) through 78 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 35 total violations for this system , of which 2 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 22 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 8 violations (MR). 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, 610 of 1,147 UCMR5-tested systems have reported PFAS detections (53.2%).

Knob Hill Water System Denton's 35 violations sit below 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
234
Total Violations
35
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
78
County
Denton
School/Daycare
No
MCL Violations
0
Monitoring Violations
22
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 8 2003
Nitrite MR 6 2024
Public Notice Other 4 2025
E. COLI MR 4 2017
Chlorine MR 4 2015
LEAD AND COPPER RULE REVISIONS TT 2 2024
LEAD AND COPPER RULE REVISIONS RPT 2 2024

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 Knob Hill Water System Denton.

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 TX0610068 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 Knob Hill Water System Denton 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
2025 Public Notice Other 4 SDWIS / TX0610068 / 7500
2024 Nitrite MR 6 SDWIS / TX0610068 / 1041
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / TX0610068 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / TX0610068 / 5200
2017 E. COLI MR 4 SDWIS / TX0610068 / 3014
2015 Chlorine MR 4 SDWIS / TX0610068 / 0999
2003 Coliform (TCR) MR 8 SDWIS / TX0610068 / 3100

How Knob Hill Water System Denton Compares

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

Metric Knob Hill Water System Denton Texas avg Federal benchmark
Total violations 35 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 53.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 234 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 Knob Hill Water System Denton water safe to drink? ▼
Knob Hill Water System Denton (PWS ID: TX0610068) has 35 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 234 people using Groundwater sources.
How many people does Knob Hill Water System Denton serve? ▼
Knob Hill Water System Denton serves 234 people in Little Elm, Texas. It is a Private-owned system using Groundwater water sources with 78 service connections.
What type of violations does Knob Hill Water System Denton have? ▼
Knob Hill Water System Denton has 35 total violations: 2 health-based violations (MCL exceedances or treatment failures), 22 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Knob Hill Water System Denton water? ▼
No PFAS testing data is available for Knob Hill Water System Denton under the EPA's UCMR5 monitoring program.
What water source does Knob Hill Water System Denton use? ▼
Knob Hill Water System Denton 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.