What was found in Seguin's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1520 µg/L 15% of the EPA limit 10000 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019
Highest in the city: 1610 µg/L — CITY OF SEGUIN · 32,736 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 1577 µg/L 16% of the EPA limit 10000 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2015 | 4/4 | SYR4 |
| Fluoride | 234 µg/L 5.9% of the EPA limit 4000 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019
Highest in the city: 493.4999999999998 µg/L — CITY OF SEGUIN · 32,736 people · 2019 | 4/4 | SYR4 |
| Copper | 375.99999999999966 µg/L 29% of the EPA limit 1300 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Chlorite | 185.99999999999994 µg/L 19% of the EPA limit 1000 µg/L Highest in the city: SCHERTZ SEGUIN LOCAL GOVERNMENT CORPORAT · 0 people · 2019 | 1/4 | SYR4 |
| Barium | 109 µg/L 5.5% of the EPA limit 2000 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019
Highest in the city: 114.4 µg/L — SCHERTZ SEGUIN LOCAL GOVERNMENT CORPORAT · 0 people · 2019 | 4/4 | SYR4 |
| TTHM | 103.94 µg/L 130% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 58.35999999999997 µg/L 97% of the EPA limit 60 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Chloroform | 56.8 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 38.88999999999999 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 2/4 | SYR4 |
| Bromodichloromethane | 37.61 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Lithium | 36.3 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2024 | 2/4 | UCMR-5 |
| Trichloroacetic Acid | 11.82 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019
Highest in the city: 25.024999999999988 µg/L — CITY OF SEGUIN · 32,736 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 22.86 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Lead | 20.919999999999998 µg/L 139% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 3/4 | SYR4 |
| Gross Beta Particle Activity | 9.870000000000001 pCi/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2017
Highest in the city: 10.4 pCi/L — SCHERTZ SEGUIN LOCAL GOVERNMENT CORPORAT · 0 people · 2019 | 4/4 | SYR4 |
| Bromoform | 8.8 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Selenium | 8.75 µg/L 18% of the EPA limit 50 µg/L Highest in the city: MEMORY LANE MHP · 30 people · 2019 | 2/4 | SYR4 |
| Monochloroacetic Acid | 8.58 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 8.1 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.865 pCi/L 39% of the EPA limit 15 pCi/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2017 | 2/4 | SYR4 |
| Monobromoacetic Acid | 3.7099999999999933 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.23 pCi/L 45% of the EPA limit 5 pCi/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2017
Highest in the city: 3.1 pCi/L — CITY OF SEGUIN · 32,736 people · 2017 | 4/4 | SYR4 |
| Arsenic | 2.4 µg/L 24% of the EPA limit 10 µg/L Highest in the city: MEMORY LANE MHP · 30 people · 2019 | 1/4 | SYR4 |
| Dalapon | 1.085 µg/L 0.5% of the EPA limit 200 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019
Highest in the city: 1.685 µg/L — CITY OF SEGUIN · 32,736 people · 2019 | 2/4 | SYR4 |
| Atrazine | 0.8505 µg/L 28% of the EPA limit 3 µg/L Highest in the city: CITY OF SEGUIN · 32,736 people · 2019 | 1/4 | SYR4 |
| Xylenes, Total | 0.7000 µg/L 0% of the EPA limit 10000 µg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0054 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2024
Highest in the city: 0.0097 µg/L — CITY OF SEGUIN · 32,736 people · 2024 | 2/4 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2024 | 1/4 | UCMR-5 |
| Pfpea | 0.0035 µg/L No EPA limit set Main supplier: SPRINGS HILL SUD · 35,541 people · 2024
Highest in the city: 0.0039 µg/L — CITY OF SEGUIN · 32,736 people · 2024 | 2/4 | UCMR-5 |
| Lead | 0.0011 mg/L 7.5% of the EPA limit 0.0150 mg/L Main supplier: SPRINGS HILL SUD · 35,541 people · 2025
Highest in the city: 0.0014 mg/L — CITY OF SEGUIN · 32,736 people · 2025 | 3/4 | LCR |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Seguin
| Supplier | Population served |
|---|---|
| SPRINGS HILL SUD | 35,541 |
| CITY OF SEGUIN | 32,736 |
| MEMORY LANE MHP | 30 |
| SCHERTZ SEGUIN LOCAL GOVERNMENT CORPORAT | 0 |
Frequently asked questions about Seguin tap water
Is Seguin tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Seguin. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Seguin?
4 public water suppliers report drinking-water monitoring for Seguin, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Seguin's water?
The contaminants EPA monitoring detected in Seguin include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Chlorite. The full list, with the level at the main supplier and the data source, is in the table above.
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.