Ouachita Parish Water Quality: 3 Cities Ranked by the Records

Name: Ouachita Parish Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Ouachita Parish, Louisiana: 3 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Ouachita Parish

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 2 systems of 3 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest10.6 µg/L

CITY OF WEST MONROE WATER SYSTEM10.6 µg/LSample date: 2023-11-07 to 2024-05-07
GOWC WEST HWY 80 ARK ROAD WS9.74 µg/LSample date: 2024-11-12 to 2025-05-15
CITY OF MONROE WATER SYSTEMNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-11-07 to 2024-08-15

Lead (90th percentile)Detected in 2 systems of 3 tested15 µg/L federal action level · US EPAHighest2 µg/L

GOWC WEST HWY 80 ARK ROAD WS2 µg/LMonitoring period: 2024–2026 (still open)
CITY OF WEST MONROE WATER SYSTEM1 µg/LMonitoring period: 2024–2026 (still open)
CITY OF MONROE WATER SYSTEMNot detectedMonitoring period: 2023–2025

Perfluorobutanoic acid (PFBA)Detected in 1 system of 3 testedNo federal or state limit; shown for transparencyHighest8.2 ng/L

CITY OF MONROE WATER SYSTEM8.2 ng/LSample date: 2023-11-07 to 2024-08-15
CITY OF WEST MONROE WATER SYSTEMNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-11-07 to 2024-05-07
GOWC WEST HWY 80 ARK ROAD WSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-05-15

28 PFAS tested, none detected in any systemShow

Tested in these 3 systems: CITY OF MONROE WATER SYSTEM, CITY OF WEST MONROE WATER SYSTEM, GOWC WEST HWY 80 ARK ROAD WS

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

3 cities

Cities ranked by the records

1
West MonroeCITY OF WEST MONROE WATER SYSTEM
No PFAS detectedLead below action level
Open city report →
2
ClaiborneGOWC WEST HWY 80 ARK ROAD WS
No PFAS detectedLead below action level
Open city report →
3
MonroeCITY OF MONROE WATER SYSTEM
PFAS detected, within limit
Open city report →

Showing 3 of 3 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Ouachita ParishPFAS detected in 1 of 3 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Louisiana

Lead

0of 3 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Louisiana

Who supplies the county

Largest water systems

MonroeCITY OF MONROE WATER SYSTEM · LA1073031
57,000 served
West MonroeCITY OF WEST MONROE WATER SYSTEM · LA1073056
16,005 served
ClaiborneGOWC WEST HWY 80 ARK ROAD WS · LA1073055
14,649 served

Questions

Frequently asked

How does Ouachita Parish tap water compare across cities?

PurityMap ranks 3 cities in Ouachita Parish by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is West Monroe's main water system: CITY OF WEST MONROE WATER SYSTEM · PWSID LA1073056 · Purity Score 92 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Ouachita Parish cities had a PFAS sample above a 2024 EPA limit?

None of the 3 Ouachita Parish city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.

Is there lead in Ouachita Parish tap water?

Utilities report lead as a 90th-percentile result from home taps. 2 of 3 Ouachita Parish cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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