Water report · not indexed
What is in the water at 78593
3 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
NORTH ALAMO WSC
PWSID TX1080029 · TX · serves 171,195 people
PFAS and lithium
6 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 44 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 50 µg/L | 26 | 8/8/2023 |
| PFBA | 0.012 µg/L | 12 | 8/8/2023 |
| PFPeA | 0.0038 µg/L | 2 | 12/12/2023 |
| PFHxA | 0.0035 µg/L | 2 | 2/15/2023 |
| PFHxS | 0.0034 µg/L | 1 | 5/8/2023 |
| PFBS | 0.003 µg/L | 1 | 8/8/2023 |
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
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.
EAST RIO HONDO WSC
PWSID TX0310096 · TX · serves 24,756 people
PFAS and lithium
9 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 48 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 59 µg/L | 12 | 7/30/2024 |
| PFBA | 0.015 µg/L | 9 | 7/17/2024 |
| PFPeA | 0.012 µg/L | 9 | 7/17/2024 |
| PFHxA | 0.011 µg/L | 9 | 7/17/2024 |
| PFOS | 0.0056 µg/L | 3 | 7/17/2024 |
| PFOA | 0.0054 µg/L | 1 | 1/30/2025 |
| PFHxS | 0.0045 µg/L | 2 | 7/17/2024 |
| PFHpA | 0.004 µg/L | 1 | 1/30/2025 |
| PFBS | 0.0035 µg/L | 2 | 7/17/2024 |
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 SANTA ROSA
PWSID TX0310009 · TX · serves 2,883 people
PFAS and lithium
Not sampled for PFAS. EPA’s UCMR 5 monitoring covered every system serving more than 3,300 people and only a sample of smaller ones. This system was not in it, so there is no result to show, which is not the same as a result showing nothing.
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.