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Tap water quality report

N.S. Mayport

EPA monitoring tested this supplier for 98 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

98
contaminants tested
7
detected
20,500
people served
15
health-based violations
Florida rankingsLead in FloridaPFAS in Florida
Water source
Ground water
Ownership
Federal government
Counties served
Duval

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.

15
health-based violations
20
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Archived 2008-07-01 → 2008-07-31
MCL Health-based Archived 2008-04-01 → 2008-04-30
MCL Health-based Archived 2008-04-01 → 2008-04-30
MCL Health-based Archived 1994-10-01 → 1994-10-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
94.856 µg/L 119%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 123.03 µg/L
137/137 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
23.253 µg/L 39%
of the EPA limit 60 µg/L
worst single sample: 30.74 µg/L
128/128 SYR4 2012–2019
Lead
0.0029 mg/L 19%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2025
Fluoride
670 µg/L 17%
of the EPA limit 4000 µg/L
 4/4 SYR4 2014–2017
Barium
26 µg/L 1.3%
of the EPA limit 2000 µg/L
 2/2 SYR4 2014–2017
Copper
3.61 µg/L 0.3%
of the EPA limit 1300 µg/L
worst single sample: 3.7 µg/L
2/2 SYR4 2014–2017
Nitrate
140 µg/L 1.4%
of the EPA limit 10000 µg/L
 2/18 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-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CDR BRIAN MACK
Phone
904-472-7308

Frequently asked questions about N.S. Mayport

Is N.S. Mayport tap water safe to drink?

EPA monitoring detected 7 contaminants in N.S. Mayport'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 N.S. Mayport's water?

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

How many people does N.S. Mayport serve?

N.S. Mayport reports serving 20,500 people in Florida, per its EPA record.

Has N.S. Mayport had any water quality violations?

The EPA has 20 violations on file for N.S. Mayport, of which 15 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.