Virginia / Reports /

Combined sewer overflow (CSO) reported — City of Richmond Department of Public Utilities (Richmond WWTP and combined sewer system), May 23, 2026

Ended (as reported) · City of Richmond Department of Public Utilities (monthly CSO outfall report)

Source: City of Richmond Department of Public Utilities (monthly CSO outfall report) via City of Richmond monthly CSO outfall reports (per-outfall overflow events, XLSX), record CSO_11-20260523T0405, the source gives no report time, retrieved 2026-11-03 02:39 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: City of Richmond Department of Public Utilities (Richmond WWTP and combined sewer system) (federal wastewater discharge permit, NPDES, VA0063177). Outlet: 011 “CSO 11”. Location: 37.53383, -77.45297; location source: from the state's or EPA's outfall layer.

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

2. Waters named in the notice

The notice names: “James River”. DirtyWaterWatch links this report to James River, VA. Match basis: the outlet's permit and number in EPA and state records.

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

May 23, 2026, 4:05 AM EDT

Ended

May 27, 2026, 6:30 PM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

not given

Source last updated

not given

Last retrieved by DirtyWaterWatch

2026-11-03 02:39 UTC

What and how much

Type

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system.

Status in the record

Ended (as reported)

Material

“combined sewage and stormwater”

Volume

150,000 gallons (estimated)

Volume as reported

“0.15 MG (observed overflow volume)”

Advice from City of Richmond Department of Public Utilities (monthly CSO outfall report)

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

Source and versions

Source

City of Richmond monthly CSO outfall reports (per-outfall overflow events, XLSX)

Source record number

CSO_11-20260523T0405

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "month": "2026-05",
  "outfall_sheet": "CSO_11-Events",
  "row": {
    "label": "2026May23",
    "start": "46165.17013888889",
    "end": "46169.77083333334",
    "Rainfall, in": "3.74",
    "Observed Overflow Volume, mg": "0.15",
    "overflow_duration_hours": "1.2"
  },
  "rain_in": 3.74,
  "overflow_duration_hours": 1.2,
  "summary_row": {
    "Sensor Type": "Level",
    "% of Report with Good Data": "100",
    "Number of Observed Activations": "1",
    "Observed Overflow Volume, MG": "0.15"
  },
  "workbook_title": "May2026 Overflow Summary; 81.0 MG Overflow Observed",
  "workbook_notes": [
    "Note: Activations are defined by CSO volumes > 0.01 MG and an interevent time of 72 hours",
    "Note: Any observed negative flows could be backflow from James River",
    "Note: Any observed negative flows could be due to high James River levels and flow eddies within structure"
  ],
  "echo_outfall": {
    "outfall": "011",
    "receiving_water_echo": "James River",
    "water_slug": "james-river-va",
    "match": "geometry+name",
    "distance_m": 182
  },
  "_time_basis": "Excel serial dates with no zone stated; read as America/New_York wall-clock time (inferred: Richmond's map uses America/New_York).",
  "activation_note": "Workbook note: activations are defined by CSO volumes > 0.01 MG and an interevent time of 72 hours, so the end can be days after the overflow hours (overflow_duration_hours)."
}