Water report · not indexed
What is in the water at 78665
9 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
MANVILLE WSC
PWSID TX2270033 · TX · serves 39,648 people
PFAS and lithium
11 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 59 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 84 µg/L | 17 | 8/30/2023 |
| PFNA | 0.024 µg/L | 3 | 8/30/2023 |
| PFOS | 0.012 µg/L | 7 | 8/30/2023 |
| PFBS | 0.01 µg/L | 8 | 8/30/2023 |
| PFPeA | 0.0091 µg/L | 7 | 8/30/2023 |
| PFHxA | 0.0087 µg/L | 4 | 8/30/2023 |
| PFBA | 0.0074 µg/L | 3 | 8/30/2023 |
| PFHxS | 0.007 µg/L | 7 | 8/30/2023 |
| PFOA | 0.0059 µg/L | 1 | 2/22/2023 |
| PFHpA | 0.0043 µg/L | 1 | 2/22/2023 |
| PFUnA | 0.0027 µg/L | 1 | 2/22/2023 |
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.
TRAVIS COUNTY WCID 18
PWSID TX2270083 · TX · serves 5,733 people
PFAS and lithium
2 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 3 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFBA | 0.0082 µg/L | 2 | 9/22/2025 |
| PFPeA | 0.0031 µg/L | 1 | 7/9/2025 |
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.
TRAVIS COUNTY WCID 10
PWSID TX2270182 · TX · serves 9,204 people
PFAS and lithium
5 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 5 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFBA | 0.0099 µg/L | 1 | 7/8/2025 |
| PFOS | 0.0055 µg/L | 1 | 7/8/2025 |
| PFHxS | 0.004 µg/L | 1 | 7/8/2025 |
| PFPeA | 0.0034 µg/L | 1 | 7/8/2025 |
| PFBS | 0.0031 µg/L | 1 | 7/8/2025 |
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.
TRAVIS COUNTY MUD 18
PWSID TX2270403 · TX
PFAS and lithium
1 compound detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 6 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFBA | 0.0086 µg/L | 6 | 9/23/2025 |
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.
CITY OF ROUND ROCK
PWSID TX2460003 · TX · serves 130,662 people
PFAS and lithium
5 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 12 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 14 µg/L | 6 | 4/29/2025 |
| PFBS | 0.0067 µg/L | 2 | 4/29/2025 |
| PFPeA | 0.0067 µg/L | 2 | 4/29/2025 |
| PFBA | 0.0051 µg/L | 1 | 10/23/2024 |
| PFHxA | 0.0037 µg/L | 1 | 10/23/2024 |
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.
JONAH WATER SUD
PWSID TX2460022 · TX · serves 29,378 people
PFAS and lithium
8 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 37 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 39 µg/L | 9 | 8/3/2023 |
| PFPeA | 0.021 µg/L | 6 | 5/10/2023 |
| PFBA | 0.016 µg/L | 4 | 5/10/2023 |
| PFBS | 0.0093 µg/L | 6 | 5/10/2023 |
| PFHxA | 0.0092 µg/L | 6 | 5/10/2023 |
| PFOS | 0.0057 µg/L | 2 | 11/27/2023 |
| PFHxS | 0.0056 µg/L | 3 | 5/10/2023 |
| PFOA | 0.0051 µg/L | 1 | 11/27/2023 |
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.
WILLIAMSON COUNTY MUD 10
PWSID TX2460145 · TX
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 11 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 17 µg/L | 4 | 8/20/2024 |
| PFBA | 0.0056 µg/L | 2 | 2/20/2024 |
| PFPeA | 0.0038 µg/L | 3 | 5/21/2024 |
| PFBS | 0.003 µg/L | 2 | 5/21/2024 |
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.
WILLIAMSON COUNTY WSID 3
PWSID TX2460152 · TX
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 5 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 72 µg/L | 2 | 8/18/2025 |
| PFNA | 0.005 µg/L | 1 | 8/18/2025 |
| PFBS | 0.0035 µg/L | 1 | 8/18/2025 |
| PFPeA | 0.0031 µg/L | 1 | 8/18/2025 |
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.
WILLIAMSON COUNTY MUD 11
PWSID TX2460159 · TX · serves 4,248 people
PFAS and lithium
3 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 5 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 12 µg/L | 2 | 5/21/2025 |
| PFBA | 0.0056 µg/L | 2 | 5/21/2025 |
| PFPeA | 0.003 µg/L | 1 | 5/21/2025 |
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.