Water report · not indexed
What is in the water at 18914
6 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
AQUA PA CHALFONT
PWSID PA1090005 · PA · serves 5,900 people
PFAS and lithium
9 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 27 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 9.7 µg/L | 3 | 8/19/2024 |
| PFOS | 0.019 µg/L | 3 | 8/19/2024 |
| PFHxA | 0.018 µg/L | 4 | 8/19/2024 |
| PFPeA | 0.018 µg/L | 5 | 8/19/2024 |
| PFBA | 0.009 µg/L | 2 | 8/19/2024 |
| PFOA | 0.0088 µg/L | 3 | 8/19/2024 |
| PFBS | 0.0055 µg/L | 4 | 8/19/2024 |
| PFHpA | 0.0031 µg/L | 2 | 2/20/2024 |
| PFHxS | 0.0031 µg/L | 1 | 2/20/2024 |
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.
NWWA WARRINGTON TOWNSHIP
PWSID PA1090070 · PA · serves 21,588 people
PFAS and lithium
2 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 8 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 21 µg/L | 6 | 7/16/2025 |
| PFBA | 0.007 µg/L | 2 | 7/16/2025 |
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
Median hardness 155 mg/L as CaCO₃, measured at 7 stations serving this system across 16 results, 2021-11-16 to 2023-09-27. Measured in the water source and distribution area, not at a tap, and not in your home.
DTMA MAIN SYSTEM
PWSID PA1090128 · PA · serves 8,655 people
PFAS and lithium
9 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 94 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 15 µg/L | 6 | 7/15/2025 |
| PFOA | 0.014 µg/L | 14 | 7/15/2025 |
| PFOS | 0.013 µg/L | 14 | 7/15/2025 |
| PFPeA | 0.01 µg/L | 14 | 7/15/2025 |
| PFBS | 0.0098 µg/L | 14 | 7/15/2025 |
| PFHxA | 0.0084 µg/L | 14 | 7/15/2025 |
| PFNA | 0.0074 µg/L | 4 | 7/15/2025 |
| PFHpA | 0.0072 µg/L | 11 | 7/15/2025 |
| PFBA | 0.0063 µg/L | 3 | 7/15/2025 |
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.
HORSHAM WATER&SEWER AUTHORITY
PWSID PA1460033 · PA · serves 26,000 people
PFAS and lithium
9 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 25 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 14 µg/L | 2 | 8/5/2024 |
| PFPeA | 0.065 µg/L | 9 | 8/6/2024 |
| PFBA | 0.041 µg/L | 8 | 8/5/2024 |
| PFOS | 0.034 µg/L | 1 | 12/16/2024 |
| PFOA | 0.018 µg/L | 1 | 12/16/2024 |
| PFHxS | 0.011 µg/L | 1 | 12/16/2024 |
| PFHxA | 0.0071 µg/L | 1 | 12/16/2024 |
| PFBS | 0.0057 µg/L | 1 | 12/16/2024 |
| PFHpA | 0.0044 µg/L | 1 | 12/16/2024 |
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
Median hardness 154 mg/L as CaCO₃, measured at 5 stations serving this system across 5 results, 2021-11-16 to 2021-11-16. Measured in the water source and distribution area, not at a tap, and not in your home.
NORTH PENN WATER AUTHORITY
PWSID PA1460034 · PA · serves 91,941 people
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 21 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 24 µg/L | 8 | 4/10/2024 |
| PFOA | 0.0051 µg/L | 5 | 4/10/2024 |
| PFBS | 0.004 µg/L | 6 | 4/10/2024 |
| PFPeA | 0.0034 µg/L | 2 | 4/10/2024 |
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
Median hardness 161 mg/L as CaCO₃, measured at 5 stations serving this system across 19 results, 2015-02-04 to 2020-09-21. Measured in the water source and distribution area, not at a tap, and not in your home.
NORTH WALES WATER AUTHORITY
PWSID PA1460048 · PA · serves 72,496 people
PFAS and lithium
10 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 70 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 9.7 µg/L | 2 | 8/14/2024 |
| PFOA | 0.013 µg/L | 12 | 8/14/2024 |
| PFOS | 0.011 µg/L | 11 | 8/14/2024 |
| PFPeA | 0.0093 µg/L | 10 | 8/14/2024 |
| PFHxA | 0.0081 µg/L | 10 | 8/14/2024 |
| PFBA | 0.0068 µg/L | 3 | 8/14/2024 |
| PFBS | 0.0064 µg/L | 12 | 8/14/2024 |
| PFHpA | 0.0058 µg/L | 7 | 8/14/2024 |
| PFNA | 0.0056 µg/L | 1 | 8/14/2024 |
| PFHxS | 0.0037 µg/L | 2 | 8/14/2024 |
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.
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.