Is City of Mandeville Water Supply Tap Water Safe? Quality Report

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2015-04-01 → 2015-04-30
MCL	Health-based	Archived	2015-04-01 → 2015-04-30
MCL	Health-based	Archived	2015-04-01 → 2015-04-30
MCL	Health-based	Archived	2007-03-01 → 2007-03-31
MCL	Health-based	Archived	2007-03-01 → 2007-03-31
MCL	Health-based	Archived	2007-03-01 → 2007-03-31
MCL	Health-based	Archived	1992-03-01 → 1992-03-31
MCL	Health-based	Archived	1992-03-01 → 1992-03-31
MCL	Health-based	Archived	1992-03-01 → 1992-03-31
MR	Monitoring	Resolved	2009-01-01 → 2009-03-31

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Lead	4 µg/L 27% of the EPA limit 15 µg/L worst single sample: 5 µg/L	27/65	SYR4	2014–2019
Chloroform	1.71 µg/L No EPA limit set worst single sample: 2.1 µg/L	14/33	SYR4	2012–2019
TTHM	1.71 µg/L 2.1% of the EPA limit 80 µg/L worst single sample: 2.1 µg/L	14/33	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	4.32 µg/L 7.2% of the EPA limit 60 µg/L worst single sample: 6 µg/L	13/33	SYR4	2012–2019
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L	12/12	SYR4	2013–2019
Dichloroacetic Acid	2.13 µg/L No EPA limit set worst single sample: 2.4 µg/L	10/33	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	10/10	LCR	2023
Nitrate-Nitrite	180 µg/L 1.8% of the EPA limit 10000 µg/L	10/84	SYR4	2012–2019
Lithium	14.6 µg/L No EPA limit set	6/6	UCMR-5	2024
Pentachlorophenol	0.1270 µg/L 13% of the EPA limit 1 µg/L	4/12	SYR4	2013–2019
Combined Radium (-226 And -228)	0.3470 pCi/L 6.9% of the EPA limit 5 pCi/L worst single sample: 0.3600 pCi/L	3/7	SYR4	2016–2019
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L	2/12	SYR4	2013–2019
Copper	100 µg/L 7.7% of the EPA limit 1300 µg/L	2/65	SYR4	2014–2019
Dalapon	2.7038 µg/L 1.4% of the EPA limit 200 µg/L worst single sample: 2.804 µg/L	2/12	SYR4	2013–2019
Di(2-ethylhexyl) Phthalate	1.0525 µg/L 18% of the EPA limit 6 µg/L worst single sample: 1.07 µg/L	2/10	SYR4	2013–2017
Xylenes, Total	5.17 µg/L 0.1% of the EPA limit 10000 µg/L worst single sample: 5.2 µg/L	2/11	SYR4	2013–2019
Asbestos	1 MFL 14% of the EPA limit 7 MFL	1/2	SYR4	2019
Dibromoacetic Acid	1 µg/L No EPA limit set	1/33	SYR4	2012–2019
Ethylbenzene	0.9400 µg/L 0.1% of the EPA limit 700 µg/L	1/11	SYR4	2013–2019
Monobromoacetic Acid	6 µg/L No EPA limit set	1/33	SYR4	2012–2019
Monochloroacetic Acid	3.2 µg/L No EPA limit set	1/33	SYR4	2012–2019

91 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, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDi(2-ethylhexyl) AdipateDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: MADDEN, CLAY
Phone: 985-626-1082
Email: [email protected]

Frequently asked questions about City of Mandeville Water Supply

Is City of Mandeville Water Supply tap water safe to drink?

EPA monitoring detected 21 contaminants in City of Mandeville 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 City of Mandeville Water Supply's water?

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

How many people does City of Mandeville Water Supply serve?

City of Mandeville Water Supply reports serving 13,000 people in Louisiana, per its EPA record.

Has City of Mandeville Water Supply had any water quality violations?

The EPA has 15 violations on file for City of Mandeville Water Supply, of which 9 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.