Water Quality Report · Updated May 12, 2026
MONROE WATER SYSTEM
MONROE WATER SYSTEM delivers tap water graded C (65/100) by TapWaterSafety.org. The utility serves approximately 57,000 residents in MONROE, Louisiana using surface water. 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. For questions, the utility can be reached at 318-329-2310.
Is MONROE tap water safe to drink?
MONROE WATER SYSTEM delivers tap water that earns a grade of C (65/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 57,000 residents in MONROE, drawing from surface water. Despite being legal under US EPA standards, this water would fail the European Union's Drinking Water Directive, primarily due to haloacetic acids (haa9) significantly above health guideline.
Public testing data identifies 14 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Dichloroacetic acid, Trichloroacetic acid, Arsenic, Chloroform, Bromodichloromethane, Dibromoacetic acid, Chromium (hexavalent), Radium, combined (-226 and -228), Atrazine, Simazine, Nitrate and nitrite. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for MONROE residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for MONROE WATER SYSTEM.
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.
Contact MONROE WATER SYSTEM
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for MONROE
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 65/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
MONROE WATER SYSTEM service area
This water system serves 1 community in Ouachita Parish County, Louisiana. Click any city for its dedicated tap water quality page.
Find the right filter for MONROE water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.