BRYN MAWR, PA · Chester County

DEERFIELD KNOLL WATER COMPANY Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of June 1, 1995. 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): PA1150167
System type: Community Water System
Population served: 270
Service connections: 119
Ownership: public/private mix
Water source: groundwater (wells)

DEERFIELD KNOLL WATER COMPANY is one of 3,064 community water systems in Pennsylvania in the 500 or fewer people size category, formerly serving 270 people from groundwater.

EPA's federal records list this system as inactive in 1995; the record below is historical.

As of August 1, 2026, its federal record holds 9 entries between 1984 and 1995, all of which EPA lists as closed. Nothing has been added since 1995.

All 9 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 volatile organic chemicals, the Radionuclides and Revised Rad Rule, and the Total Coliform Rules.

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1995 – May 31, 1995
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1993 – December 31, 1993
Archived
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 1991 – March 31, 1991
Archived
Monitoring, Regular
—
Carbon tetrachloride
January 1, 1991 – March 31, 1991
Archived
Monitoring, Regular
—
Benzene
January 1, 1991 – March 31, 1991
Archived
Monitoring, Regular
—
Trichloroethylene
January 1, 1991 – March 31, 1991
Archived
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 1991 – March 31, 1991
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 1988 – June 30, 1992
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 1984 – June 30, 1988
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
May 1, 1995 – May 31, 1995	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Nitrate	—	Archived
January 1, 1991 – March 31, 1991	Monitoring, Regular	1,2-Dichloroethane	—	Archived
January 1, 1991 – March 31, 1991	Monitoring, Regular	Carbon tetrachloride	—	Archived
January 1, 1991 – March 31, 1991	Monitoring, Regular	Benzene	—	Archived
January 1, 1991 – March 31, 1991	Monitoring, Regular	Trichloroethylene	—	Archived
January 1, 1991 – March 31, 1991	Monitoring, Regular	p-Dichlorobenzene	—	Archived
July 1, 1988 – June 30, 1992	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
July 1, 1984 – June 30, 1988	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

September 30, 1988State Formal Notice of Violation issued1 linked violation
February 11, 1988State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
August 17, 1987State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
July 6, 1987State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record

Last known contact on file (system is inactive)

Not on record

610-525-1400

BRYN MAWR, PA 19010