Water Quality Report · Updated May 12, 2026
E JEFFERSON WW DISTRICT 1
E JEFFERSON WW DISTRICT 1 delivers tap water graded D (63/100) by TapWaterSafety.org. The utility serves approximately 275,163 residents in JEFFERSON, 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. For questions, the utility can be reached at 504-838-4305.
Is JEFFERSON tap water safe to drink?
E JEFFERSON WW DISTRICT 1 delivers tap water that earns a grade of D (63/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including haloacetic acids (haa9) significantly above health guideline.
The utility serves 275,163 residents in JEFFERSON, 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 13 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Dibromochloromethane, Dibromoacetic acid, Nitrate and nitrite, Chromium (hexavalent), Radium, combined (-226 and -228), Atrazine. 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 JEFFERSON residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for E JEFFERSON WW DISTRICT 1.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 40.6 ppb, 677x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 35.9 ppb, 359x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 53.8 ppb, 359x above the EWG health guideline of 0.15 ppb.
Contact E JEFFERSON WW DISTRICT 1
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 JEFFERSON
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.
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 63/100 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 |
40.6 ppb | 0.06 | — | — | — | — | — | 677× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
35.9 ppb | 0.1 | 60.0 | 60 | — | — | — | 359× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
53.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 359× over |
| Bromodichloromethane Disinfection byproduct |
13.8 ppb | 0.06 | — | — | — | — | — | 229× over |
| Trichloroacetic acid Disinfection byproduct |
16.0 ppb | 0.1 | — | — | — | — | — | 160× over |
| Chloroform Disinfection byproduct |
34.7 ppb | 0.4 | — | — | — | — | — | 87× over |
| Dichloroacetic acid Disinfection byproduct |
16.2 ppb | 0.2 | — | — | — | — | — | 81× over |
| Dibromochloromethane Disinfection byproduct |
4.66 ppb | 0.1 | — | — | — | — | — | 47× over |
| Dibromoacetic acid Disinfection byproduct |
0.955 ppb | 0.03 | — | — | — | — | — | 32× over |
| Nitrate and nitrite Inorganic |
1.04 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 7.5× over |
| Chromium (hexavalent) Heavy metal |
0.0745 ppb | 0.02 | — | — | — | — | — | 3.7× over |
| Radium, combined (-226 and -228) Radiological |
0.12 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.4× over |
| Atrazine Pesticide/Herbicide |
0.139 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Fails EU |
| Bromoform Disinfection byproduct |
0.426 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Carbon tetrachloride Volatile organic compound |
0.0542 ppb | 0.1 | 5.0 | — | — | — | — | Below guideline |
| Simazine Pesticide/Herbicide |
0.0437 ppb | 0.1 | 4.0 | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0553 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Aluminum Heavy metal |
66.7 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
2.39 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
1.75 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
1.55 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
6.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.864 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.26 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Hexachlorocyclopentadiene Other |
0.0102 ppb | 2.0 | 50.0 | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
3.53 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Toluene Volatile organic compound |
0.0625 ppb | 150.0 | 1000.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.164 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromide Other |
27.0 ppb | — | — | — | — | — | — | Below guideline |
| Dalapon Pesticide/Herbicide |
0.131 ppb | — | 200.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.611 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
2.94 ppb | — | — | — | — | — | — | Below guideline |
| Quinoline Other |
0.00383 ppb | — | — | — | — | — | — | 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.
E JEFFERSON WW DISTRICT 1 service area
This water system serves 1 community in Jefferson Parish County, Louisiana. Click any city for its dedicated tap water quality page.
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