Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 44,196 people (14,732 connections) with surface water from its own intake, and buys water from GBRA Western Canyon Water Supply.
From EPA's record for TX0460019. PurityMap is independent of CLWSC Canyon Lake Shores.
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5 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 0.135 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 0.129 mg/L | 0.080 mg/L | Archived |
| From July 2025 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From July 2025 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 0.113 mg/L | 0.080 mg/L | Archived |
EPA required this system to test for 30 unregulated and emerging contaminants, from October 2024 to July 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 18.2 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorobutanoic acid (PFBA) | 7.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-15 to 2025-07-29 | UCMR5 Analytical Results: CLWSC CANYON LAKE SHORES (TX0460019) |
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →CLWSC Canyon Lake Shores's phone number on EPA record is 830-312-4600. Its mailing address is PO BOX 1742, CANYON LAKE, TX 78133-0005.
According to EPA's record, CLWSC Canyon Lake Shores uses surface water from its own intake, and buys water from GBRA Western Canyon Water Supply.
EPA's record shows 5 health-based violations for CLWSC Canyon Lake Shores in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting January 2026. EPA also lists 11 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in CLWSC Canyon Lake Shores's latest lead and copper round, which ended in June 2026, was 1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for CLWSC Canyon Lake Shores. Its phone number on EPA record is 830-312-4600. Its mailing address on EPA record is PO BOX 1742, CANYON LAKE, TX 78133-0005. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.