Public water system · TX0910085
ActiveThompson Heights Water System
At a glance
Thompson Heights Water System (PWSID TX0910085) is an active community water system in Grayson County, Texas. It reports serving 414 people through 138 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
414
Service connections
138
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Thompson Heights Water System compare with other water systems in Grayson County?
By EPA's size categories, Thompson Heights Water System is a very small system (500 people or fewer). Grayson County has 50 active public water systems. Its population served is well below the county average of 3,197 people per system, and accounts for 0.3% of the 159,854 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active community water system reports serving 6,703 people, so Thompson Heights Water System is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Texas has 4,594 active community water systems, 65% of the state's 7,078 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 1,192 Texas systems (17%) list purchased surface water as their primary source.
Who owns and regulates Thompson Heights Water System?
EPA lists Thompson Heights Water System as privately owned. 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. 20 of the 50 active systems in Grayson County (40%) are also privately owned.
Does Thompson Heights Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2026. The violations listed here began between December 2014 and April 2026. By type: 7 monitoring and reporting, 4 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (6 of them). EPA lists 9 as resolved and 3 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-04-05 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2025-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2025-07-02 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Unaddressed |
| 2025-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2020-01-09 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2017-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
The 12 most recent 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.
Thompson Heights Water System: frequently asked questions
Who runs Thompson Heights Water System?
Thompson Heights Water System (PWSID TX0910085) is a community water system privately owned. It is regulated by the TX state drinking water program.
How many people does Thompson Heights Water System serve?
Thompson Heights Water System reports serving 414 people through 138 service connections in Grayson County, Texas.
Where does Thompson Heights Water System get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Thompson Heights Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 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 Thompson Heights Water System's 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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the TX state drinking water program.
Where can I find Thompson Heights Water System's water quality report?
As a community water system, Thompson Heights Water System must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Grayson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Sherman | Grayson | 43,645 | Community | Surface water |
| City of Denison | Grayson | 27,500 | Community | Surface water |
| City of Van Alstyne | Grayson | 7,000 | Community | Purchased surface water |
| Two Way Sud | Grayson | 6,804 | Community | Groundwater |
| South Grayson Sud | Grayson | 6,750 | Community | Groundwater |
| City of Howe | Grayson | 4,548 | 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, “Thompson Heights Water System, PWSID TX0910085, Texas”, https://aquacensus.com/water-systems/texas/thompson-heights-water-system-tx0910085 (data as of October 1, 2026).