Public water system · LA1073031
ActiveCity of Monroe Water System
At a glance
City of Monroe Water System (PWSID LA1073031) is an active community water system in Ouachita Parish County, Louisiana. It reports serving 57,000 people through 19,000 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
57,000
Service connections
19,000
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Monroe Water System compare with other water systems in Ouachita Parish County?
By EPA's size categories, City of Monroe Water System is a large system (10,001 to 100,000 people). Ouachita Parish County has 28 active public water systems, and City of Monroe Water System is the largest of them by population served. Its population served is about 8.8 times the county average of 6,514 people per system, and accounts for 31% of the 182,392 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 City of Monroe Water System is about 8.5 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 53 Louisiana systems (4.7%) list surface water as their primary source.
Who owns and regulates City of Monroe Water System?
EPA lists City of Monroe 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. 3 of the 28 active systems in Ouachita Parish County (11%) are also owned by a local government.
Does City of Monroe Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in January 2026. The violations listed here began between April 2010 and January 2026. By type: 8 required treatment not met, 3 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Carbon, total (4 of them). EPA lists 9 as resolved and 3 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 |
|---|---|---|---|---|
| 2026-01-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Archived |
| 2026-01-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2026-01-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Archived |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2019-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2019-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2014-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-01-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Archived |
| 2010-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2010-10-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2010-07-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2010-04-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | 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.
City of Monroe Water System: frequently asked questions
Who runs City of Monroe Water System?
City of Monroe Water System (PWSID LA1073031) is a community water system owned by a local government. It is regulated by the LA state drinking water program.
How many people does City of Monroe Water System serve?
City of Monroe Water System reports serving 57,000 people through 19,000 service connections in Ouachita Parish County, Louisiana.
Where does City of Monroe Water System get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Monroe Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in January 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 City of Monroe 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, 11 are health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the LA state drinking water program.
Where can I find City of Monroe Water System's water quality report?
As a community water system, City of Monroe 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 Ouachita Parish County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| West Monroe Water System | Ouachita Parish | 16,005 | Community | Groundwater |
| West Hwy 80 Ark Road Ws | Ouachita Parish | 14,649 | Community | Groundwater |
| Gowc North Water System | Ouachita Parish | 13,287 | Community | Groundwater |
| Gowc East Water System | Ouachita Parish | 11,742 | Community | Groundwater |
| Cheniere Drew North Water System | Ouachita Parish | 11,280 | Community | Groundwater |
| Southwest Ouachita Waterworks, Inc. | Ouachita Parish | 10,725 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “City of Monroe Water System, PWSID LA1073031, Louisiana”, https://aquacensus.com/water-systems/louisiana/city-of-monroe-water-system-la1073031 (data as of October 1, 2026).