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Tap water quality report

City of Seguin

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
32,736
people served
53
health-based violations
Texas rankingsLead in TexasPFAS in Texas
Water source
Surface water
Ownership
Local government
Counties served
Guadalupe

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.

53
health-based violations
54
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2016-04-01 → 2016-06-30
MCL Health-based Resolved 2016-04-01 → 2016-06-30
MCL Health-based Resolved 2016-04-01 → 2016-06-30
MCL Health-based Resolved 2016-04-01 → 2016-06-30
MCL Health-based Resolved 2016-01-01 → 2016-03-31
MCL Health-based Resolved 2016-01-01 → 2016-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0039 µg/L 4/5 2024
Pfba 0.0097 µg/L 2/6 2024

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
Dibromochloromethane
18.335 µg/L
No EPA limit set
worst single sample: 22.2 µg/L
134/134 SYR4 2012–2019
Bromodichloromethane
23.48 µg/L
No EPA limit set
worst single sample: 39 µg/L
129/134 SYR4 2012–2019
TTHM
62.8 µg/L 78%
of the EPA limit 80 µg/L
worst single sample: 135 µg/L
126/126 SYR4 2012–2019
Bromoform
4.41 µg/L
No EPA limit set
worst single sample: 6.9 µg/L
119/134 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
47.96 µg/L 80%
of the EPA limit 60 µg/L
worst single sample: 119 µg/L
98/126 SYR4 2012–2019
Dibromoacetic Acid
5.69 µg/L
No EPA limit set
worst single sample: 6.6 µg/L
92/126 SYR4 2012–2019
Chloroform
41.62 µg/L
No EPA limit set
worst single sample: 89.09 µg/L
78/134 SYR4 2012–2019
Copper
310.35 µg/L 24%
of the EPA limit 1300 µg/L
worst single sample: 450 µg/L
72/95 SYR4 2013–2019
Dichloroacetic Acid
25.875 µg/L
No EPA limit set
worst single sample: 56.9 µg/L
54/126 SYR4 2012–2019
Trichloroacetic Acid
25.025 µg/L
No EPA limit set
worst single sample: 57.4 µg/L
38/126 SYR4 2012–2019
Lead
3.7 µg/L 25%
of the EPA limit 15 µg/L
worst single sample: 6.42 µg/L
32/95 SYR4 2013–2019
Nitrate
1610 µg/L 16%
of the EPA limit 10000 µg/L
 18/34 SYR4 2012–2019
Lead
0.0014 mg/L 9.7%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Fluoride
493.5 µg/L 12%
of the EPA limit 4000 µg/L
worst single sample: 630 µg/L
8/8 SYR4 2012–2019
Barium
100.49 µg/L 5%
of the EPA limit 2000 µg/L
worst single sample: 101 µg/L
7/7 SYR4 2013–2019
Monobromoacetic Acid
3.4 µg/L
No EPA limit set
worst single sample: 4 µg/L
6/126 SYR4 2012–2019
Monochloroacetic Acid
3.45 µg/L
No EPA limit set
worst single sample: 3.5 µg/L
6/126 SYR4 2012–2019
Lithium
18.6 µg/L
No EPA limit set
 3/6 UCMR-5 2024
Atrazine
0.8505 µg/L 28%
of the EPA limit 3 µg/L
worst single sample: 0.8900 µg/L
2/8 SYR4 2012–2019
Dalapon
1.685 µg/L 0.8%
of the EPA limit 200 µg/L
worst single sample: 1.7 µg/L
2/115 SYR4 2013–2019
Combined Radium (-226 And -228)
3.1 pCi/L 62%
of the EPA limit 5 pCi/L
 1/1 SYR4 2017
Gross Alpha, Excl. Radon And U
3.1 pCi/L 21%
of the EPA limit 15 pCi/L
 1/1 SYR4 2017
Gross Beta Particle Activity
8.2 pCi/L
No EPA limit set
 1/2 SYR4 2012–2017
Nitrate-Nitrite
1510 µg/L 15%
of the EPA limit 10000 µg/L
 1/4 SYR4 2012–2015
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 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DODGEN, DONNA
Phone
830-401-2307
Email
[email protected]

Frequently asked questions about City of Seguin

Is City of Seguin tap water safe to drink?

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

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

How many people does City of Seguin serve?

City of Seguin reports serving 32,736 people in Texas, per its EPA record.

Has City of Seguin had any water quality violations?

The EPA has 54 violations on file for City of Seguin, of which 53 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.