Drinking Water Compliance OS

BYRN MAWR, PA · Chester County

PSW LARESERVE Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of October 25, 2000. 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 July 4, 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)
PA1150180
System type
Community Water System
Population served
210
Service connections
70
Ownership
privately owned
Water source
groundwater (wells)

Violation history

  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 1996 – December 31, 1996

    Resolved
  • OCCT/SOWT Study/Recommendation

    Health-based

    Lead and Copper Rule

    January 1, 1995 – January 28, 1998

    Resolved
  • Monitoring, Regular

    Arsenic

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Selenium

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Nitrate

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Mercury

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Fluoride

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Chromium

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Cadmium

    June 24, 1988 – June 23, 1991

    Archived
  • Monitoring, Regular

    Barium

    June 24, 1988 – June 23, 1991

    Archived

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

Enforcement actions

Last known contact on file (system is inactive)

Not on record

610-525-1400

BYRN MAWR, PA 190103489