Maryland Sewer Overflow Reports with Location and Volume Data

Maryland environmental data tracks reported sewer overflows from February 10th, 2023 onward. The Maryland Department of the Environment (MDE) collects reports from public sewer system owners and operators. Reported details include overflow location, cause, duration, and estimated discharge volume.

Use Cases

• Correlate OVERFLOW_CAUSE with DURATION_MINUTE and DISCHARGE_VOLUME to identify primary failure modes.
• Map OVERFLOW_LATITUDE and OVERFLOW_LONGITUDE with COUNTY and RECEIVING_WATER to visualize spatial risk patterns.
• Analyze START_DATE and DURATION_HOUR trends to predict overflow frequency during specific seasons or times.
• Link OWNER_NAME or NPDES_NO with OVERFLOW_TYPE to assess compliance and performance across different systems.

Strengths

• Contains geospatial coordinates (OVERFLOW_LATITUDE, OVERFLOW_LONGITUDE) for mapping.
• Includes 19 distinct columns covering cause, location, volume, and duration of incidents.

Limitations

• Row count is unknown, preventing assessment of statistical significance.
• DISCHARGE_VOLUME may be estimated rather than measured, introducing potential inaccuracy.
• Data completeness relies on voluntary reporting, so some incidents may be missing.

Provenance

Source

opendata.maryland.gov, likely the Maryland Department of the Environment (MDE).

Collection Method

Mandatory reports submitted by public sewer system owners or operators.

Time Range

From February 10, 2023 onward.

Freshness

Data updated to April 3, 2026, with records starting February 10, 2023.

Geography

State of Maryland, United States.