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Tap water quality report

Slidell Water Supply

EPA monitoring tested this supplier for 112 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

112
contaminants tested
24
detected
35,547
people served
74
health-based violations
Louisiana rankingsLead in LouisianaPFAS in Louisiana
Water source
Ground water
Ownership
Local government
Counties served
St. Tammany Parish

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

74
health-based violations
91
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2022-09-01 → 2022-09-30
MCL Health-based Resolved 2022-09-01 → 2022-09-30
MCL Health-based Resolved 2022-09-01 → 2022-09-30
MCL Health-based Resolved 2022-09-01 → 2022-09-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30
MCL Health-based Resolved 2015-06-01 → 2015-06-30

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Chloroform
22.2 µg/L
No EPA limit set
 107/111 SYR4 2012–2019
TTHM
28 µg/L 35%
of the EPA limit 80 µg/L
 107/111 SYR4 2012–2019
Dichloroacetic Acid
8.4 µg/L
No EPA limit set
 106/111 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
17.3 µg/L 29%
of the EPA limit 60 µg/L
 106/111 SYR4 2012–2019
Lead
16 µg/L 107%
of the EPA limit, in the worst sample — 15 µg/L
 66/158 SYR4 2014–2019
Copper
1100 µg/L 85%
of the EPA limit 1300 µg/L
 61/158 SYR4 2014–2019
Trichloroacetic Acid
5.4 µg/L
No EPA limit set
 58/111 SYR4 2012–2019
Bromodichloromethane
7.9 µg/L
No EPA limit set
 38/111 SYR4 2012–2019
Lithium
17.3 µg/L
No EPA limit set
 14/14 UCMR-5 2025
Fluoride
370 µg/L 9.3%
of the EPA limit 4000 µg/L
 12/12 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2024
Dibromochloromethane
4.5 µg/L
No EPA limit set
 10/111 SYR4 2012–2019
Nitrate-Nitrite
39 µg/L 0.4%
of the EPA limit 10000 µg/L
 10/72 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
12.6 µg/L 210%
of the EPA limit, in the worst sample — 6 µg/L
 5/12 SYR4 2013–2019
Barium
15 µg/L 0.8%
of the EPA limit 2000 µg/L
 4/12 SYR4 2013–2019
Dalapon
3.765 µg/L 1.9%
of the EPA limit 200 µg/L
 4/12 SYR4 2013–2019
Monochloroacetic Acid
7.8 µg/L
No EPA limit set
 4/111 SYR4 2012–2019
Selenium
1.6 µg/L 3.2%
of the EPA limit 50 µg/L
 4/12 SYR4 2013–2019
Combined Radium (-226 And -228)
0.7120 pCi/L 14%
of the EPA limit 5 pCi/L
 3/8 SYR4 2016–2019
Dibromoacetic Acid
1.6 µg/L
No EPA limit set
 3/111 SYR4 2012–2019
Dichloromethane
1.2 µg/L 24%
of the EPA limit 5 µg/L
 1/12 SYR4 2013–2019
Di(2-ethylhexyl) Adipate
0.5600 µg/L 0.1%
of the EPA limit 400 µg/L
 1/10 SYR4 2013–2019
Gross Alpha, Excl. Radon And U
3.07 pCi/L 20%
of the EPA limit 15 pCi/L
 1/8 SYR4 2013–2016
Gross Beta Particle Activity
2.05 pCi/L
No EPA limit set
 1/12 SYR4 2013–2019
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
FANDAL, RANDY
Phone
985-646-4333
Email
rfandal@cityofslidell.org

Frequently asked questions about Slidell Water Supply

Is Slidell Water Supply tap water safe to drink?

EPA monitoring detected 24 contaminants in Slidell Water Supply's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Slidell Water Supply's water?

EPA monitoring detected Chloroform, TTHM, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), Lead, and others. The full list with the level and data source for each is above.

How many people does Slidell Water Supply serve?

Slidell Water Supply reports serving 35,547 people in Louisiana, per its EPA record.

Has Slidell Water Supply had any water quality violations?

The EPA has 91 violations on file for Slidell Water Supply, of which 74 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.