Public water system · LA1097005
ActiveTown of Leonville Water System
At a glance
Town of Leonville Water System (PWSID LA1097005) is an active community water system in St. Landry Parish County, Louisiana. It reports serving 9,552 people through 3,184 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in August 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,552
Service connections
3,184
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Town of Leonville Water System compare with other water systems in St. Landry Parish County?
By EPA's size categories, Town of Leonville Water System is a medium system (3,301 to 10,000 people). St. Landry Parish County has 28 active public water systems, and Town of Leonville Water System is the 3rd-largest of them by population served. Its population served is about 139% above the county average of 4,003 people per system, and accounts for 8.5% of the 112,071 people reported by systems filed under the county. Across Louisiana, the 1,121 active systems average 4,685 people each. Nationally, the average active community water system reports serving 6,703 people, so Town of Leonville Water System is about 43% above 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. Louisiana has 815 active community water systems, 73% of the state's 1,121 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 966 Louisiana systems (86%) list groundwater as their primary source.
Who owns and regulates Town of Leonville Water System?
EPA lists Town of Leonville Water System as owned by a local government. The LA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 18 of the 28 active systems in St. Landry Parish County (64%) are also owned by a local government.
Does Town of Leonville Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in August 2021. The violations listed here began between July 2014 and August 2021. By type: 8 required treatment not met, 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Groundwater Rule (8 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2021-08-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2017-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-01-05 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | 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.
Town of Leonville Water System: frequently asked questions
Who runs Town of Leonville Water System?
Town of Leonville Water System (PWSID LA1097005) is a community water system owned by a local government. It is regulated by the LA state drinking water program.
How many people does Town of Leonville Water System serve?
Town of Leonville Water System reports serving 9,552 people through 3,184 service connections in St. Landry Parish County, Louisiana.
Where does Town of Leonville Water System 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 Town of Leonville Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in August 2021. 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 Town of Leonville 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, 8 are health-based, and the most recent began in August 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the LA state drinking water program.
Where can I find Town of Leonville Water System's water quality report?
As a community water system, Town of Leonville 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 St. Landry Parish County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Opelousas Water System | St. Landry Parish | 20,388 | Community | Groundwater |
| Lawco - Eunice Water System | St. Landry Parish | 15,393 | Community | Groundwater |
| Lewisburg Bellevue Water System | St. Landry Parish | 8,226 | Community | Groundwater |
| Savoy Swords Water System Inc. | St. Landry Parish | 7,326 | Community | Groundwater |
| Plaisance Water System | St. Landry Parish | 6,465 | Community | Groundwater |
| Prairie Ronde Water System Inc. | St. Landry Parish | 6,090 | Community | Groundwater |
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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, “Town of Leonville Water System, PWSID LA1097005, Louisiana”, https://aquacensus.com/water-systems/louisiana/town-of-leonville-water-system-la1097005 (data as of October 1, 2026).