Public water system · LA1103041
ActiveSlidell Water Supply
At a glance
Slidell Water Supply (PWSID LA1103041) is an active community water system in St. Tammany Parish County, Louisiana. It reports serving 35,547 people through 11,849 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 September 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
35,547
Service connections
11,849
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Slidell Water Supply compare with other water systems in St. Tammany Parish County?
By EPA's size categories, Slidell Water Supply is a large system (10,001 to 100,000 people). St. Tammany Parish County has 170 active public water systems, and Slidell Water Supply is the largest of them by population served. Its population served is about 27 times the county average of 1,296 people per system, and accounts for 16% of the 220,311 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 Slidell Water Supply is about 5.3 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. 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 Slidell Water Supply?
EPA lists Slidell Water Supply 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. 37 of the 170 active systems in St. Tammany Parish County (22%) are also owned by a local government.
Does Slidell Water Supply have drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in September 2022. The violations listed here began between July 2008 and September 2022. By type: 8 contaminant level above the legal limit and 4 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 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 |
|---|---|---|---|---|
| 2022-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2015-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2015-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2015-06-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2015-06-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2015-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2015-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2009-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Slidell Water Supply: frequently asked questions
Who runs Slidell Water Supply?
Slidell Water Supply (PWSID LA1103041) is a community water system owned by a local government. It is regulated by the LA state drinking water program.
How many people does Slidell Water Supply serve?
Slidell Water Supply reports serving 35,547 people through 11,849 service connections in St. Tammany Parish County, Louisiana.
Where does Slidell Water Supply 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 Slidell Water Supply 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 September 2022. 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 Slidell Water Supply'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 September 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the LA state drinking water program.
Where can I find Slidell Water Supply's water quality report?
As a community water system, Slidell Water Supply 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. Tammany Parish County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| St Tam Parish- Bedico -Faubourg-Coquille | St. Tammany Parish | 18,372 | Community | Groundwater |
| St Tam Parish - Briarwood Terrace | St. Tammany Parish | 17,536 | Community | Groundwater |
| City of Covington Water Supply | St. Tammany Parish | 16,185 | Community | Groundwater |
| City of Mandeville Water Supply | St. Tammany Parish | 13,000 | Community | Groundwater |
| Utilities Inc. - North Park Water Supply | St. Tammany Parish | 11,298 | Community | Groundwater |
| Bayou Liberty Water Association | St. Tammany Parish | 10,791 | 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, “Slidell Water Supply, PWSID LA1103041, Louisiana”, https://aquacensus.com/water-systems/louisiana/slidell-water-supply-la1103041 (data as of October 1, 2026).