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Tap water quality report

City of Nassau Bay

EPA monitoring tested this supplier for 109 contaminants and detected 26. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
26
detected
5,347
people served
0
health-based violations
Texas rankingsLead in TexasPFAS in Texas
Water source
SWP
Ownership
Local government
Counties served
Harris

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.

0
health-based violations
11
violations on file
0
still open
ViolationTypeStatusPeriod
MON Monitoring Resolved 2024-03-01 → 2024-03-31
MON Monitoring Resolved 2024-03-01 → 2024-03-31
MON Monitoring Resolved 2024-03-01 → 2024-03-31
MON Monitoring Resolved 2024-03-01 → 2024-03-31
Other Monitoring Resolved 2014-02-12
Other Monitoring Resolved 2014-02-12
MR Monitoring Resolved 2013-01-01 → 2013-03-31
MR Monitoring Resolved 2013-01-01 → 2013-03-31
MR Monitoring Resolved 2013-01-01 → 2013-03-31
MR Monitoring Resolved 2013-01-01 → 2013-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0066 µg/L 4/6 2025
Pfhxa 0.0045 µg/L 3/6 2025
Pfpea 0.0047 µg/L 3/7 2025
6:2 Fts 0.0097 µg/L 2/7 2025

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
Copper
708.4 µg/L 54%
of the EPA limit 1300 µg/L
worst single sample: 1320 µg/L
129/131 SYR4 2013–2019
Lead
16.69 µg/L 111%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 50.6 µg/L
107/131 SYR4 2013–2019
Bromodichloromethane
12.35 µg/L
No EPA limit set
worst single sample: 15.4 µg/L
67/67 SYR4 2012–2019
Chloroform
38.85 µg/L
No EPA limit set
worst single sample: 53.5 µg/L
67/67 SYR4 2012–2019
Dichloroacetic Acid
41.415 µg/L
No EPA limit set
worst single sample: 64.7 µg/L
62/62 SYR4 2012–2019
TTHM
49.295 µg/L 62%
of the EPA limit 80 µg/L
worst single sample: 59.6 µg/L
62/62 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
58.5 µg/L 98%
of the EPA limit 60 µg/L
worst single sample: 89.1 µg/L
62/62 SYR4 2012–2019
Trichloroacetic Acid
14.53 µg/L
No EPA limit set
worst single sample: 19.9 µg/L
62/62 SYR4 2012–2019
Dibromochloromethane
4.2 µg/L
No EPA limit set
worst single sample: 5.9 µg/L
54/67 SYR4 2012–2019
Dibromoacetic Acid
3.405 µg/L
No EPA limit set
worst single sample: 4.5 µg/L
38/62 SYR4 2012–2019
Nitrate
611.5 µg/L 6.1%
of the EPA limit 10000 µg/L
worst single sample: 650 µg/L
32/32 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 21/21 LCR 2023
Monochloroacetic Acid
14.26 µg/L
No EPA limit set
worst single sample: 14.7 µg/L
12/62 SYR4 2012–2019
Nitrate-Nitrite
619 µg/L 6.2%
of the EPA limit 10000 µg/L
worst single sample: 670 µg/L
7/7 SYR4 2012–2015
Atrazine
0.3750 µg/L 13%
of the EPA limit 3 µg/L
worst single sample: 0.3800 µg/L
6/9 SYR4 2012–2019
Simazine
0.1725 µg/L 4.3%
of the EPA limit 4 µg/L
worst single sample: 0.1800 µg/L
6/9 SYR4 2012–2019
Nitrite
38 µg/L 3.8%
of the EPA limit 1000 µg/L
worst single sample: 40 µg/L
5/7 SYR4 2012–2015
Barium
39.755 µg/L 2%
of the EPA limit 2000 µg/L
worst single sample: 40.2 µg/L
2/2 SYR4 2016–2019
Fluoride
477.5 µg/L 12%
of the EPA limit 4000 µg/L
worst single sample: 480 µg/L
2/2 SYR4 2014–2017
Combined Radium (-226 And -228)
1.5 pCi/L 30%
of the EPA limit 5 pCi/L
 1/1 SYR4 2016
Hexachlorocyclopentadiene
0.1800 µg/L 0.4%
of the EPA limit 50 µg/L
 1/9 SYR4 2012–2019
Monobromoacetic Acid
1 µg/L
No EPA limit set
 1/62 SYR4 2012–2019
83 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 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DENMAN, MARK
Phone
281-333-4211
Email
[email protected]

Frequently asked questions about City of Nassau Bay

Is City of Nassau Bay tap water safe to drink?

EPA monitoring detected 26 contaminants in City of Nassau Bay'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 Nassau Bay's water?

EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does City of Nassau Bay serve?

City of Nassau Bay reports serving 5,347 people in Texas, per its EPA record.

Has City of Nassau Bay had any water quality violations?

The EPA has 11 violations on file for City of Nassau Bay, of which 0 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.