Public water system record
Thompson Heights Water System
Serves an area of Grayson County, TX · 414 people served
Federal records show no health-based violations and 10 monitoring/reporting issues for Thompson Heights Water System in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 10
Key facts
- Thompson Heights Water System buys its water from City of Denison.
- Most recent formal enforcement: signed compliance agreement by Texas, March 2010.
- Record on file since 1999, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 132 service lines.
Check whether Thompson Heights Water System serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2025 | Active |
|
Consumer Confidence Rule
OTHER
|
Jul 2, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2025 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2020 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2020 | Resolved |
|
Public Notice
OTHER
|
Jan 9, 2020 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
Full record since 1999
EPA's records for Thompson Heights Water System go back to 1999. Before October 19, 2016 they list 4 health-based violations (4 resolved) and 29 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 3 | 21 |
| 2010 to October 18, 2016 | 1 | 7 |
| October 19, 2016 to 2019 | 0 | 4 |
| 2020s | 0 | 6 |
Most recent health-based violation before October 19, 2016: Total Coliform, began November 2013, Resolved.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Oct 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jul 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Apr 1, 2009 | Resolved |
Enforcement actions
Texas regulators and EPA took 2 formal enforcement actions against Thompson Heights Water System between 2000 and 2010. The most recent was a signed compliance agreement in March 2010.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 22, 2010 | Texas | Signed compliance agreement | 3 violations (3 health-based): Total Trihalomethanes (TTHMs) |
| May 3, 2000 | EPA | Compliance order (no penalty) | 1 violation: Consumer Confidence Rule |
Where the water comes from
Thompson Heights Water System buys its water from City of Denison. It lists no wells or intakes of its own.
Buys water from
- City of Denison Denison, TX
Annual water quality report
Thompson Heights Water System must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Thompson Heights Water System for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Texas.
Certified drinking water labs by state EPA guidance for private wells