Water report · not indexed
What is in the water at 78006
4 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
SAN ANTONIO WATER SYSTEM
PWSID TX0150018 · TX · serves 1,999,472 people
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 44 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 26 µg/L | 38 | 5/9/2023 |
| PFBA | 0.0092 µg/L | 3 | 5/8/2023 |
| PFBS | 0.0038 µg/L | 2 | 5/21/2024 |
| PFPeA | 0.0032 µg/L | 1 | 5/8/2023 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
We do not state a hardness for any system, and this is why. Hardness here would come from environmental monitoring stations that happen to sit inside your water system’s service area. We checked that method against the figures twenty large utilities publish about their own supply: it agreed with the utility fewer than half the time, and where it was wrong it usually read HIGH. Cities supplied from a distant watershed came off worst, because the stations end up sampling local groundwater nobody drinks. We are paid a referral fee when somebody asks for an installer, so a number that overstates hardness is the last error we are willing to publish. Your utility publishes its own hardness in its annual water quality report, and that figure is the one to trust.
CLWSC CANYON LAKE SHORES
PWSID TX0460019 · TX · serves 40,749 people
PFAS and lithium
2 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 9 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 18 µg/L | 7 | 4/29/2025 |
| PFBA | 0.0071 µg/L | 2 | 7/29/2025 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
3 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- MCL · contaminant code 2950 · began 2025-07-01
- MCL · contaminant code 2950 · began 2025-10-01
- MCL · contaminant code 2950 · began 2026-01-01
Hardness
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
SJWTX TRIPLE PEAK PLANT
PWSID TX0460172 · TX · serves 32,973 people
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 18 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 28 µg/L | 11 | 7/23/2024 |
| PFHxS | 0.013 µg/L | 3 | 7/23/2024 |
| PFBS | 0.0064 µg/L | 2 | 7/22/2024 |
| PFOS | 0.0052 µg/L | 2 | 7/22/2024 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
CITY OF BOERNE
PWSID TX1300001 · TX · serves 22,287 people
PFAS and lithium
8 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 19 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 21 µg/L | 4 | 7/10/2024 |
| PFOS | 0.026 µg/L | 2 | 7/10/2024 |
| PFHxS | 0.025 µg/L | 2 | 7/10/2024 |
| PFBS | 0.01 µg/L | 3 | 7/10/2024 |
| PFHxA | 0.0074 µg/L | 2 | 7/10/2024 |
| PFBA | 0.0066 µg/L | 3 | 7/10/2024 |
| PFPeA | 0.0064 µg/L | 2 | 7/10/2024 |
| PFOA | 0.006 µg/L | 1 | 1/16/2025 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
What this report cannot tell you
Every figure describes water at a sampling point: a treatment plant, an entry point to the distribution system, or a monitoring station. None of it describes water arriving at your tap. Plumbing between the two can add lead and copper, and if your home was built before 1986 a test kit tells you something no federal dataset can.
Sources: EPA UCMR 5 occurrence (final release, frozen July 2026) · EPA SDWIS health-based violations · USGS and state monitoring via the Water Quality Portal · EPA Public Water System Service Area Boundaries v3. Compiled 2026-09-01.