Tap Water Quality Report
Tap water quality in MONROE, Louisiana
Tap water in MONROE, Louisiana receives a grade of F (52/100) from TapWaterSafety.org. It's served by MONROE WATER SYSTEM. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in MONROE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MONROE.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 64.9 ppb, 1082x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 39.1 ppb, 391x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 27.4 ppb, 183x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.325 ppb.
EPA compliance record
Official U.S. EPA records for MONROE WATER SYSTEM (system ID LA1073031) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment not met | 01/01/2026 | Open |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule | Required treatment not met | 01/01/2026 | Open |
| Lead and Copper Rule Revisions | Required treatment not met | 10/17/2024 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for MONROE
Filters matched to the specific contaminants in MONROE's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in MONROE's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
64.9 ppb | 0.06 | — | — | — | — | — | 1082× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
39.1 ppb | 0.1 | 60.0 | 60 | — | — | — | 391× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
27.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 183× over |
| Dichloroacetic acid Disinfection byproduct |
27.2 ppb | 0.2 | — | — | — | — | — | 136× over |
| Trichloroacetic acid Disinfection byproduct |
9.65 ppb | 0.1 | — | — | — | — | — | 96× over |
| Arsenic Heavy metal |
0.325 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 81× over |
| Chloroform Disinfection byproduct |
24.1 ppb | 0.4 | — | — | — | — | — | 60× over |
| Bromodichloromethane Disinfection byproduct |
3.29 ppb | 0.06 | — | — | — | — | — | 55× over |
| Dibromoacetic acid Disinfection byproduct |
0.122 ppb | 0.03 | — | — | — | — | — | 4.1× over |
| Chromium (hexavalent) Heavy metal |
0.075 ppb | 0.02 | — | — | — | — | — | 3.8× over |
| Radium, combined (-226 and -228) Radiological |
0.14 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.7× over |
| Atrazine Pesticide/Herbicide |
0.139 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Fails EU |
| Simazine Pesticide/Herbicide |
0.128 ppb | 0.1 | 4.0 | — | — | — | — | 1.3× over |
| Nitrate and nitrite Inorganic |
0.167 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.2× over |
| Aluminum Heavy metal |
475.0 ppb | 600.0 | — | 200 | — | 600 | — | Fails EU |
| Dibromochloromethane Disinfection byproduct |
0.0243 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
44.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
17.8 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0333 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
2.14 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.2 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Pentachlorophenol Other |
0.00267 ppb | 0.3 | 1.0 | — | — | — | — | Below guideline |
| Hexachlorocyclopentadiene Other |
0.0108 ppb | 2.0 | 50.0 | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
3.45 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| 2,4-D Pesticide/Herbicide |
0.0317 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0469 ppb | 1500.0 | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from MONROE WATER SYSTEM.