What was found in Canyon Lake'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-Nitrite | 2618 µg/L 26% of the EPA limit 10000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 8/10 | SYR4 |
| Nitrate | 2316 µg/L 23% of the EPA limit 10000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 2470 µg/L — KINGS POINT WSC · 174 people · 2019 | 9/10 | SYR4 |
| Fluoride | 1284 µg/L 32% of the EPA limit 4000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 1849 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 9/10 | SYR4 |
| Chlorite | 620.5 µg/L 62% of the EPA limit 1000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 2/10 | SYR4 |
| Copper | 187.7 µg/L 14% of the EPA limit 1300 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 480 µg/L — SJWTX GLENWOOD SUBDIVISION · 2,985 people · 2017 | 8/10 | SYR4 |
| TTHM | 80.44 µg/L 101% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 84.13 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 10/10 | SYR4 |
| Barium | 43.25 µg/L 2.2% of the EPA limit 2000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 61.37 µg/L — TEXAS COUNTRY WATER · 321 people · 2017 | 9/10 | SYR4 |
| Cyanide | 48.5 µg/L 24% of the EPA limit 200 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 2/10 | SYR4 |
| Chloroform | 24.3 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 35.44 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 8/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 22.84 µg/L 38% of the EPA limit 60 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 33.025 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 9/10 | SYR4 |
| Bromodichloromethane | 26.76 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 29.5 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 10/10 | SYR4 |
| Lithium | 18.2 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2025
Highest in the city: 28.4 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2024 | 2/10 | UCMR-5 |
| Selenium | 24.3 µg/L 49% of the EPA limit 50 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 2/10 | SYR4 |
| Dibromochloromethane | 23.5 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 10/10 | SYR4 |
| Dichloroacetic Acid | 11.84 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 20.255 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 6/10 | SYR4 |
| Nitrite | 20 µg/L 2% of the EPA limit 1000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 1/10 | SYR4 |
| Bromoform | 7.9 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 17.74 µg/L — CANYON LAKE ESTATES WATER SUPPLY · 171 people · 2019 | 10/10 | SYR4 |
| Lead | 6.36 µg/L 42% of the EPA limit 15 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 12.03 µg/L — KINGS POINT WSC · 174 people · 2019 | 8/10 | SYR4 |
| Gross Beta Particle Activity | 11.5 pCi/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 3/10 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.06 pCi/L 40% of the EPA limit 15 pCi/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 10.495 pCi/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 6/10 | SYR4 |
| Trichloroacetic Acid | 4.93 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 9.475 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 4/10 | SYR4 |
| Dibromoacetic Acid | 8 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 8.9 µg/L — CANYON LAKE ESTATES WATER SUPPLY · 171 people · 2019 | 8/10 | SYR4 |
| Arsenic | 8.635 µg/L 86% of the EPA limit 10 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 2/10 | SYR4 |
| Monochloroacetic Acid | 2.91 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 8.34 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 4/10 | SYR4 |
| Combined Radium (-226 And -228) | 2.52 pCi/L 50% of the EPA limit 5 pCi/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 3.825 pCi/L — WESTHAVEN WSC · 171 people · 2019 | 7/10 | SYR4 |
| Chromium | 3.7485 µg/L 3.7% of the EPA limit 100 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 2/10 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1655 µg/L 19% of the EPA limit 6 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 3.6 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 3/10 | SYR4 |
| Xylenes, Total | 2.675 µg/L 0% of the EPA limit 10000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 3/10 | SYR4 |
| Toluene | 0.9000 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019
Highest in the city: 2.25 µg/L — SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 2/10 | SYR4 |
| Combined Uranium | 2.08 µg/L 6.9% of the EPA limit 30 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 4/10 | SYR4 |
| Monobromoacetic Acid | 2 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 4/10 | SYR4 |
| Dichloromethane | 1.25 µg/L 25% of the EPA limit 5 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 1/10 | SYR4 |
| Dalapon | 1.1 µg/L 0.6% of the EPA limit 200 µg/L Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 1/10 | SYR4 |
| Ethylbenzene | 0.9750 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 1/10 | SYR4 |
| Antimony, Total | 0.8320 µg/L 14% of the EPA limit 6 µg/L Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 1/10 | SYR4 |
| Carbon Tetrachloride | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2019 | 1/10 | SYR4 |
| Thallium, Total | 0.0200 µg/L 1% of the EPA limit 2 µg/L Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2019 | 1/10 | SYR4 |
| PFHXS | 0.0125 µg/L No EPA limit set Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2024 | 1/10 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2026
Highest in the city: 0.0078 mg/L — TEXAS COUNTRY WATER · 321 people · 2025 | 10/10 | LCR |
| Pfba | 0.0071 µg/L No EPA limit set Main supplier: CLWSC CANYON LAKE SHORES · 44,196 people · 2025 | 1/10 | UCMR-5 |
| PFBS | 0.0064 µg/L No EPA limit set Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2024 | 1/10 | UCMR-5 |
| PFOS | 0.0052 µg/L No EPA limit set Highest in the city: SJWTX TRIPLE PEAK PLANT · 32,973 people · 2024 | 1/10 | UCMR-5 |
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 Canyon Lake
| Supplier | Population served |
|---|---|
| CLWSC CANYON LAKE SHORES | 44,196 |
| SJWTX TRIPLE PEAK PLANT | 32,973 |
| SJWTX GLENWOOD SUBDIVISION | 2,985 |
| ROCKWALL RANCH SUBDIVISION | 1,773 |
| TEXAS COUNTRY WATER | 321 |
| KINGS POINT WSC | 174 |
| CANYON LAKE ESTATES WATER SUPPLY | 171 |
| WESTHAVEN WSC | 171 |
| SJWTX NORTH POINT SUBDIVISION | 93 |
| ELM RIDGE WATER | 63 |
Frequently asked questions about Canyon Lake tap water
Is Canyon Lake tap water safe to drink?
EPA testing detected 42 contaminants in the water serving Canyon Lake. 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 Canyon Lake?
10 public water suppliers report drinking-water monitoring for Canyon Lake, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Canyon Lake's water?
The contaminants EPA monitoring detected in Canyon Lake include Nitrate-Nitrite, Nitrate, Fluoride, Chlorite, Copper. 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.