Public water system · TX0610206

Active

Tpwd Ray Roberts Lake Isle Dubois

At a glance

Tpwd Ray Roberts Lake Isle Dubois (PWSID TX0610206) is an active transient non-community water system in Denton County, Texas. It reports serving 4,056 people through 179 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2026.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

4,056

Service connections

179

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDTX0610206

System typeTransient non-community water system

Activity statusActive

Population served4,056

Service connections179

Primary water sourceGroundwater

Owner typeState government

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyDenton County

How does Tpwd Ray Roberts Lake Isle Dubois compare with other water systems in Denton County?

By EPA's size categories, Tpwd Ray Roberts Lake Isle Dubois is a medium system (3,301 to 10,000 people). Denton County has 88 active public water systems. Its population served is about 56% below the county average of 9,202 people per system, and accounts for 0.5% of the 809,752 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Tpwd Ray Roberts Lake Isle Dubois is about 28 times that figure.

What does “transient non-community water system” mean?

A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Texas has 1,622 active transient non-community water systems, 23% of the state's 7,078 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 5,215 Texas systems (74%) list groundwater as their primary source.

Who owns and regulates Tpwd Ray Roberts Lake Isle Dubois?

EPA lists Tpwd Ray Roberts Lake Isle Dubois as owned by a state government. The TX state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 1 of the 88 active systems in Denton County (1.1%) are also owned by a state government.

Does Tpwd Ray Roberts Lake Isle Dubois have drinking water violations?

EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2026. The violations listed here began between October 2003 and January 2026. By type: 2 monitoring, 2 public notice, recordkeeping or other, 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 7 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2026-01-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2022-05-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2015-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2013-03-12	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2012-11-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2004-02-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2003-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 7 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Tpwd Ray Roberts Lake Isle Dubois: frequently asked questions

Who runs Tpwd Ray Roberts Lake Isle Dubois?

Tpwd Ray Roberts Lake Isle Dubois (PWSID TX0610206) is a transient non-community water system owned by a state government. It is regulated by the TX state drinking water program.

How many people does Tpwd Ray Roberts Lake Isle Dubois serve?

Tpwd Ray Roberts Lake Isle Dubois reports serving 4,056 people through 179 service connections in Denton County, Texas.

Where does Tpwd Ray Roberts Lake Isle Dubois get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Tpwd Ray Roberts Lake Isle Dubois have any drinking water violations?

EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2026. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Tpwd Ray Roberts Lake Isle Dubois' water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2026. For current results, consult EPA ECHO, or the TX state drinking water program.

Where can I find Tpwd Ray Roberts Lake Isle Dubois' water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Tpwd Ray Roberts Lake Isle Dubois is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Denton County

Water system	County	Population served	Type	Source
City of Denton	Denton	150,037	Community	Surface water
City of Lewisville	Denton	140,880	Community	Surface water
Mustang Sud	Denton	110,826	Community	Purchased surface water
Town of Flower Mound	Denton	80,000	Community	Purchased surface water
City of the Colony	Denton	45,367	Community	Purchased surface water
Town of Little Elm	Denton	41,000	Community	Purchased surface water

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Tpwd Ray Roberts Lake Isle Dubois, PWSID TX0610206, Texas”, https://aquacensus.com/water-systems/texas/tpwd-ray-roberts-lake-isle-dubois-tx0610206 (data as of October 1, 2026).