Public water system · TN0000511
ActiveNolensville-College Grove U.D.
At a glance
Nolensville-College Grove U.D. (PWSID TN0000511) is an active community water system in Williamson County, Tennessee. It reports serving 34,159 people through 11,944 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in April 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
34,159
Service connections
11,944
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Nolensville-College Grove U.D. compare with other water systems in Williamson County?
By EPA's size categories, Nolensville-College Grove U.D. is a large system (10,001 to 100,000 people). Williamson County has 7 active public water systems, and Nolensville-College Grove U.D. is the 4th-largest of them by population served. Its population served is roughly in line with the county average of 35,917 people per system, and accounts for 14% of the 251,417 people reported by systems filed under the county. Across Tennessee, the 1,383 active systems average 5,780 people each. Nationally, the average active community water system reports serving 6,703 people, so Nolensville-College Grove U.D. is about 5.1 times 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. Tennessee has 450 active community water systems, 33% of the state's 1,383 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 121 Tennessee systems (8.7%) list purchased surface water as their primary source.
Who owns and regulates Nolensville-College Grove U.D.?
EPA lists Nolensville-College Grove U.D. as owned by a local government. The TN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 7 active systems in Williamson County (86%) are also owned by a local government.
Does Nolensville-College Grove U.D. have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in April 2015. The violations listed here began between January 1993 and April 2015. By type: 7 monitoring and reporting and 5 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 6 as resolved and 6 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2015-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2014-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Archived |
| 2014-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2014-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2010-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-11-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2001-06-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2001-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-03-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-07-01 | Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-01-01 | Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56 | 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.
Nolensville-College Grove U.D.: frequently asked questions
Who runs Nolensville-College Grove U.D.?
Nolensville-College Grove U.D. (PWSID TN0000511) is a community water system owned by a local government. It is regulated by the TN state drinking water program.
How many people does Nolensville-College Grove U.D. serve?
Nolensville-College Grove U.D. reports serving 34,159 people through 11,944 service connections in Williamson County, Tennessee.
Where does Nolensville-College Grove U.D. 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 Nolensville-College Grove U.D. have any drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in April 2015. 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 Nolensville-College Grove U.D.'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, 5 are health-based, and the most recent began in April 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the TN state drinking water program.
Where can I find Nolensville-College Grove U.D.'s water quality report?
As a community water system, Nolensville-College Grove U.D. 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 Williamson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Franklin Water Dept | Williamson | 77,222 | Community | Surface water |
| H.B.& T.S. Utility District | Williamson | 40,094 | Community | Purchased surface water |
| Milcrofton Utility District | Williamson | 38,032 | Community | Purchased surface water |
| Brentwood Water Department | Williamson | 30,493 | Community | Purchased surface water |
| Mallory Valley U.D. | Williamson | 30,347 | Community | Purchased surface water |
| Gateway Utility Company, Inc.. | Williamson | 1,070 | 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, “Nolensville-College Grove U.D., PWSID TN0000511, Tennessee”, https://aquacensus.com/water-systems/tennessee/nolensville-college-grove-u-d-tn0000511 (data as of October 1, 2026).