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Clean Water Act discharge permit · NPDES PA0093891

HAMPSHIRE ESTATES STP, Gibsonia, PA: NPDES PA0093891 discharge permit, effluent exceedances, inspections, penalties

HAMPSHIRE ESTATES STP, held by DEER CREEK DRAINAGE BASIN AUTH, holds NPDES permit PA0093891, which discharges to Dawson Run. EPA’s file records it issued April 27, 2020 and expiring May 31, 2025.

HAMPSHIRE ESTATES STP, Gibsonia, Pennsylvania: Individual permit PA0093891, held by DEER CREEK DRAINAGE BASIN AUTH; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 27, 2020, term to May 31, 2025, by State Environmental Organization; discharges to Dawson Run.

  • Nitrogen, ammonia total [as N]: 4 limits, 9 violations of any kind, 5 effluent exceedances, latest February 28, 2026, largest 186% over the limit.
  • Coliform, fecal general: 4 limits, 9 violations of any kind, 5 effluent exceedances, latest December 31, 2024, largest 88% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 3 limits, 7 violations of any kind, 1 effluent exceedance, latest February 28, 2025, largest 8% over the limit.
  • Flow, in conduit or thru treatment plant: 2 limits, 5 violations of any kind, 1 effluent exceedance, latest February 28, 2026, largest 150% over the limit.
  • Chlorine, total residual: 2 limits, 5 violations of any kind, 1 effluent exceedance, latest March 31, 2017, largest 92% over the limit.
  • Solids, total suspended: 5 limits, 10 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • pH: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • August 11, 2023: Effluent Violations - Numeric effluent violation (ST6).
  • April 28, 2021: Effluent Violations - Numeric effluent violation (ST6).
  • August 1, 2018: Effluent Violations - Numeric effluent violation (ST6).

Pennsylvania holds 261 Publicly owned treatment works coverages of this permit type in EPA’s file; 167 were issued before PA0093891.

Coverages issued nearest PA0093891

HAMPSHIRE ESTATES STP among its neighbors

Its county holds 695, 8 of them major permits; PA0093891 is a minor permit.

Other permits in the county

Identity

Facility as filedHAMPSHIRE ESTATES STP
Permittee as filedDEER CREEK DRAINAGE BASIN AUTH
NPDES IDPA0093891
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedApril 27, 2020
Expiration dateMay 31, 2025
Issuing agencyState Environmental Organization
AddressGibsonia, PA 15044
Receiving waterDawson Run
SIC4952 – Sewerage Systems

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Nitrogen, ammonia total [as N]495February 28, 2026186% over the limit
Coliform, fecal general495December 31, 202488% over the limit
BOD, carbonaceous [5 day, 20 C]371February 28, 20258% over the limit
Flow, in conduit or thru treatment plant251February 28, 2026150% over the limit
Chlorine, total residual251March 31, 201792% over the limit
Solids, total suspended5100
BOD, 5-day, 20 deg. C240
pH240
Oxygen, dissolved [DO]120
Nitrogen, total [as N]100
Phosphorus, total [as P]100

Inspections, violations and enforcement

DateWhat EPA recordedAgency
August 11, 2023Effluent Violations - Numeric effluent violationST6
April 28, 2021Effluent Violations - Numeric effluent violationST6
August 1, 2018Effluent Violations - Numeric effluent violationST6

Inspections

EPA’s inspection file holds no inspection for NPDES PA0093891.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES PA0093891.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers the NPDES permit PA0093891 for the HAMPSHIRE ESTATES STP in Gibsonia, PA, held by DEER CREEK DRAINAGE BASIN AUTH, which discharges to Dawson Run and is administratively continued. The page lists 11 pollutants under a numeric limit and 5 pollutants with an effluent exceedance.