Water report · not indexed
What is in the water at 29485
5 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
CHARLESTON WATER SYSTEM (SC1010001)
PWSID SC1010001 · SC · serves 327,422 people
PFAS and lithium
5 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 20 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFOS | 0.0065 µg/L | 4 | 9/17/2025 |
| PFPeA | 0.005 µg/L | 4 | 9/17/2025 |
| PFOA | 0.0047 µg/L | 4 | 9/17/2025 |
| PFHxA | 0.0046 µg/L | 4 | 9/17/2025 |
| PFBS | 0.0043 µg/L | 4 | 9/17/2025 |
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
Too few readings to state a hardness. 2 station(s), 2 result(s). Below two stations and five results this page will not state a number: a median of two readings from one creek is not your water.
SUMMERVILLE CPW (SC1810003)
PWSID SC1810003 · SC · serves 81,750 people · service area inferred by a model, not supplied by the state
PFAS and lithium
6 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 22 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFOS | 0.0081 µg/L | 4 | 9/17/2024 |
| PFPeA | 0.0066 µg/L | 4 | 9/17/2024 |
| PFOA | 0.0062 µg/L | 4 | 9/17/2024 |
| PFHxA | 0.0059 µg/L | 4 | 9/17/2024 |
| PFBA | 0.0051 µg/L | 2 | 9/17/2024 |
| PFBS | 0.0044 µg/L | 4 | 9/17/2024 |
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.
DCWA KNIGHTSVILLE (1820001)
PWSID SC1820001 · SC · serves 34,877 people · service area inferred by a model, not supplied by the state
PFAS and lithium
8 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 30 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 13 µg/L | 8 | 9/11/2024 |
| PFOS | 0.0081 µg/L | 4 | 9/24/2025 |
| PFPeA | 0.0072 µg/L | 4 | 9/24/2025 |
| PFOA | 0.0065 µg/L | 4 | 9/24/2025 |
| PFHxA | 0.0062 µg/L | 4 | 9/24/2025 |
| PFBA | 0.005 µg/L | 1 | 9/11/2024 |
| PFBS | 0.0046 µg/L | 4 | 9/24/2025 |
| PFHpA | 0.003 µg/L | 1 | 9/24/2025 |
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.
DCWS ASHLEY PHOSPHATE (SC1820008)
PWSID SC1820008 · SC · serves 26,076 people · service area inferred by a model, not supplied by the state
PFAS and lithium
5 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 20 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFOS | 0.0074 µg/L | 4 | 9/19/2024 |
| PFOA | 0.0064 µg/L | 4 | 9/19/2024 |
| PFPeA | 0.006 µg/L | 4 | 9/19/2024 |
| PFHxA | 0.0051 µg/L | 4 | 9/19/2024 |
| PFBS | 0.0049 µg/L | 4 | 9/19/2024 |
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.
DCWA CALOMET VALLEY (1850009)
PWSID SC1850009 · SC
PFAS and lithium
7 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 23 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFBA | 0.007 µg/L | 2 | 5/15/2023 |
| PFPeA | 0.0067 µg/L | 4 | 5/15/2023 |
| PFOS | 0.0067 µg/L | 4 | 5/15/2023 |
| HFPO-DA | 0.0062 µg/L | 2 | 11/20/2023 |
| PFHxA | 0.0061 µg/L | 4 | 5/15/2023 |
| PFOA | 0.0052 µg/L | 3 | 5/15/2023 |
| PFBS | 0.0046 µg/L | 4 | 5/15/2023 |
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.
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 · 3 of 5 service areas here are modelled.