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Sanitary sewer overflow (SSO) reported — Calvert County DPW, Sep 25, 2026

Ended (as reported) · Calvert County DPW

Source: Calvert County DPW via MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u), record md33090cs-20260925T1630-204-n-prince-frederick-blvd, updated by the source Nov 2, 2026, 10:55 AM EST, retrieved 2026-11-03 02:31 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: Calvert County DPW. Outlet: “204 North Prince Frederick Boulevard”. Location: not given in the report or in the outlet records.

Outfall: a pipe or outlet where wastewater enters a water body.

2. Waters named in the notice

The notice names: “Mill Creek”. DirtyWaterWatch links this report to Mill Creek, MD. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

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When it happened and when it was reported

Event and notice times use Eastern Time (EST or EDT). Retrieval times use Coordinated Universal Time (UTC).

Started

Sep 25, 2026, 4:30 PM EDT

Ended

Sep 29, 2026, 4:00 PM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

not given

Source last updated

Nov 2, 2026, 10:55 AM EST

Last retrieved by DirtyWaterWatch

2026-11-03 02:31 UTC

What and how much

Type

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Status in the record

Ended (as reported)

Material

not stated

Volume

500,000 gallons (not stated whether estimated or measured)

Volume as reported

“500000 gallons”

Advice from Calvert County DPW

This report includes no advice. Check current local health notices.

Advice period

This report does not state a period. See the rule DirtyWaterWatch applies and its source.

Basis

not stated

Status history from this report

• Discharge or advisory reported Mill Creek: Discharge reported ongoing, Sep 25, 2026, 4:30 PM EDT to Sep 29, 2026, 4:00 PM EDT
• Caution Mill Creek: Within the caution period after the reported end, Sep 29, 2026, 4:00 PM EDT to Oct 2, 2026, 4:00 PM EDT

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-03 02:43 UTC.

Source and versions

Source

MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u)

Source record number

md33090cs-20260925T1630-204-n-prince-frederick-blvd

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "row": {
    "overflow_type": "SSO",
    "facility_collection_system": "Prince Frederick WWTP #2 Collection System",
    "npdes_no": "MD33090CS",
    "start_date": "09/25/2026",
    "start_time": "16:30:00",
    "duration_day": "3",
    "duration_hour": "23",
    "duration_minute": "30",
    "overflow_address": "204 North Prince Frederick Boulevard",
    "zip": "20678",
    "owner_name": "Calvert County DPW",
    "discharge_volume": "500000",
    "overflow_cause": "broken pipe above creek that eroded causing overflow",
    "receiving_water": "Mill Creek",
    "county": "Calvert",
    "penalty_id": "",
    "overflow_latitude": "",
    "overflow_longitude": "",
    "id": "59"
  },
  "_ended_at_basis": "start + duration_day/hour/minute",
  "_coords": "no coordinates",
  "_water": {
    "name_notes": [
      "mill-creek-md is the Mill Creek in cecil county; this record is in Calvert: not used (name trap)"
    ],
    "why_none": "no Maryland water record matched the name"
  },
  "_discharger_basis": "owner name",
  "_first_seen_at": "2026-11-03T02:28:49Z"
}