KENNETT SQUARE, PA · Chester County
CONISTON Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of December 27, 2001. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in Chester County, PA.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Pennsylvania’s official records. Always confirm current status with Pennsylvania before making decisions based on this information.
System facts
- System ID (PWSID)
- PA1150179
- System type
- Community Water System
- Population served
- 36
- Service connections
- 18
- Ownership
- privately owned
- Water source
- groundwater (wells)
CONISTON is one of 3,064 community water systems in Pennsylvania in the 500 or fewer people size category, formerly serving 36 people from groundwater.
EPA's federal records list this system as inactive in 2001; the record below is historical.
As of August 1, 2026, its federal record holds 4 entries between 1984 and 1993, all of which EPA lists as closed. Nothing has been added since 1993.
Of the 4, 3 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules, inorganic chemicals, and the Radionuclides and Revised Rad Rule.
Violation history
Maximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
September 1, 1993 – September 30, 1993
ArchivedMonitoring, Repeat Minor (TCR)
—Coliform (TCR)
September 1, 1993 – September 30, 1993
ArchivedMonitoring, Regular
—Nitrate
January 1, 1993 – December 31, 1993
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
July 1, 1984 – June 30, 1988
Archived
Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| September 1, 1993 – September 30, 1993 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Archived |
| September 1, 1993 – September 30, 1993 | Monitoring, Repeat Minor (TCR) | Coliform (TCR) | — | Archived |
| January 1, 1993 – December 31, 1993 | Monitoring, Regular | Nitrate | — | Resolved |
| July 1, 1984 – June 30, 1988 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state
Enforcement actions
- September 30, 1988State Formal Notice of Violation issued1 linked violation
Last known contact on file (system is inactive)
Not on record
610-388-7001
KENNETT SQUARE, PA 19348