What was found in Montgomery'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 |
|---|---|---|---|
| Fluoride | 1046 µg/L 26% of the EPA limit 4000 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 2122 µg/L — STANLEY LAKE MUD · 3,783 people · 2017 | 12/14 | SYR4 |
| Copper | 176.25 µg/L 14% of the EPA limit 1300 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 566.8 µg/L — DEL LAGO ESTATES WSC · 201 people · 2018 | 13/14 | SYR4 |
| Barium | 111.66 µg/L 5.6% of the EPA limit 2000 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 327.2 µg/L — PINE LAKE SUBDIVISION NORTH WSC · 249 people · 2019 | 12/14 | SYR4 |
| Lithium | 52.3 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2023
Highest in the city: 150 µg/L — STANLEY LAKE MUD · 3,783 people · 2024 | 2/14 | UCMR-5 |
| Nitrate | 67.5 µg/L 0.7% of the EPA limit 10000 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 140 µg/L — KEENAN WSC · 1,245 people · 2019 | 11/14 | SYR4 |
| Nitrate-Nitrite | 65.5 µg/L 0.7% of the EPA limit 10000 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 127 µg/L — KEENAN WSC · 1,245 people · 2019 | 6/14 | SYR4 |
| TTHM | 33.18 µg/L 41% of the EPA limit 80 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 107.9 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 10/14 | SYR4 |
| Cyanide | 90 µg/L 45% of the EPA limit 200 µg/L Highest in the city: DEL LAGO ESTATES WSC · 201 people · 2017 | 2/14 | SYR4 |
| Dibromochloromethane | 14.45 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 39.62 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 9/14 | SYR4 |
| Bromoform | 27.58 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 36.96 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 9/14 | SYR4 |
| Lead | 13.13 µg/L 88% of the EPA limit 15 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 32.4254 µg/L — LAKE BONANZA WSC · 2,142 people · 2017 | 12/14 | SYR4 |
| Chloroform | 6.425 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 23.6 µg/L — STANLEY LAKE MUD · 3,783 people · 2019 | 6/14 | SYR4 |
| Combined Uranium | 20 µg/L 67% of the EPA limit 30 µg/L Highest in the city: STANLEY LAKE MUD · 3,783 people · 2018 | 3/14 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.2 pCi/L 28% of the EPA limit 15 pCi/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 18.65 pCi/L — LAKE BONANZA WSC · 2,142 people · 2019 | 10/14 | SYR4 |
| Bromodichloromethane | 5.8 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 17.05 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 8/14 | SYR4 |
| Gross Beta Particle Activity | 7.5 pCi/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 14.46 pCi/L — PINE LAKE SUBDIVISION NORTH WSC · 249 people · 2018 | 11/14 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.05 µg/L 12% of the EPA limit 60 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 14.27 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 5/14 | SYR4 |
| Dibromoacetic Acid | 4.46 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 11.29 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 4/14 | SYR4 |
| Monochloroacetic Acid | 7.9 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019 | 2/14 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 6.985 µg/L 116% of the EPA limit, at the 95th percentile of samples — 6 µg/L Highest in the city: STANLEY LAKE MUD · 3,783 people · 2019 | 2/14 | SYR4 |
| Selenium | 3.675 µg/L 7.4% of the EPA limit 50 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2018
Highest in the city: 6.4 µg/L — DEL LAGO ESTATES WSC · 201 people · 2018 | 6/14 | SYR4 |
| Arsenic | 6.22 µg/L 62% of the EPA limit 10 µg/L Highest in the city: SADDLE & SURREY ACRES WSC · 54 people · 2019 | 6/14 | SYR4 |
| Combined Radium (-226 And -228) | 3 pCi/L 60% of the EPA limit 5 pCi/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2016
Highest in the city: 4.58 pCi/L — DEL LAGO ESTATES WSC · 201 people · 2018 | 10/14 | SYR4 |
| Xylenes, Total | 0.6000 µg/L 0% of the EPA limit 10000 µg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 3.15 µg/L — KEENAN WSC · 1,245 people · 2018 | 4/14 | SYR4 |
| Dichloroacetic Acid | 1.3 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2019
Highest in the city: 2.26 µg/L — CITY OF MONTGOMERY · 3,771 people · 2019 | 3/14 | SYR4 |
| Dalapon | 1.3 µg/L 0.7% of the EPA limit 200 µg/L Highest in the city: STANLEY LAKE MUD · 3,783 people · 2019 | 1/14 | SYR4 |
| Trichloroacetic Acid | 1.19 µg/L No EPA limit set Highest in the city: CITY OF MONTGOMERY · 3,771 people · 2019 | 1/14 | SYR4 |
| Ethylbenzene | 1.08 µg/L 0.2% of the EPA limit 700 µg/L Highest in the city: KEENAN WSC · 1,245 people · 2018 | 2/14 | SYR4 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L Highest in the city: CITY OF MONTGOMERY · 3,771 people · 2018 | 1/14 | SYR4 |
| Pfba | 0.0116 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2023 | 1/14 | UCMR-5 |
| 6:2 Fts | 0.0056 µg/L No EPA limit set Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2023 | 1/14 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MONTGOMERY COUNTY MUD 18 · 7,608 people · 2024
Highest in the city: 0.0029 mg/L — DIAMOND HEAD WSC · 480 people · 2023 | 13/14 | 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 Montgomery
| Supplier | Population served |
|---|---|
| MONTGOMERY COUNTY MUD 18 | 7,608 |
| STANLEY LAKE MUD | 3,783 |
| CITY OF MONTGOMERY | 3,771 |
| LAKE BONANZA WSC | 2,142 |
| KEENAN WSC | 1,245 |
| DIAMOND HEAD WSC | 480 |
| PINE LAKE SUBDIVISION NORTH WSC | 249 |
| FLAMINGO LAKES LOT OWNERS ASSOCIATION IN | 246 |
| DEL LAGO ESTATES WSC | 201 |
| LAKE LORRAINE WS | 126 |
| LAKE CONROE TERRACE WATER SYSTEM | 57 |
| SADDLE & SURREY ACRES WSC | 54 |
| MONTGOMERY COUNTY MUD 209 | 45 |
| BIG OAKS RANCHETTE SUBDIVISION | 42 |
Frequently asked questions about Montgomery tap water
Is Montgomery tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Montgomery. 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 Montgomery?
14 public water suppliers report drinking-water monitoring for Montgomery, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Montgomery's water?
The contaminants EPA monitoring detected in Montgomery include Fluoride, Copper, Barium, Lithium, Nitrate. 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.