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Posted on: January 31, 2024

Sump Pump Connections to the Sanitary Sewer System Cause Big Problems

sump pump san sewer

Reduce Your Risk! Illegal sump pump connections to the sanitary sewer system rob the system of valuable capacity and can lead to sanitary sewer backups. It only takes a few homes with illegally connected sump pumps to overload your neighborhood’s sewage main. With an overloaded system, raw sewage can overflow into homes and streets. These overflows not only cause damage that is difficult and expensive to repair, but also create health and environmental hazards. 

A sump pump is a device that reduces the risk of water damage to the underground part of a home. Usually, sump pump systems are installed in specially constructed sump pits. Water flows into the sump pit through drains or by natural water migration through the soil. The sump pump's job is to pump the water out of the pit and away from the home so the basement or crawlspace stays dry. 

Sanitary sewer pipes are designed in size and slope to carry only sewage and dirty water, not clean groundwater and rainwater. Since sanitary sewer rates are based on the number of gallons that flow through the public sewer system, unnecessarily treating clean water increases the rates for everyone. Don't let clean water into the sanitary system. 

Corte Madera Municipal Codes  (CMMC) 21.16.005 and 21.16.010 apply to you if you are illegally discharging rainwater/ground water into the Sanitary System.

21.16.005 - Improper and illegal connection to sewer lateral: it shall be improper and illegal for a contractor or owner to connect the following to a private sewer lateral: storm drains, roof drains, non-permitted or non-authorized pool drains and/or non-sewage pipes or drains, or cracks or open fittings or caps in lateral pipes letting in ground or surface water. 

21.16.010 - Drainage into sanitary sewers prohibited: No leaders from roofs and no surface drains for rainwater shall be connected to any sanitary sewer. No surface or storm water, seepage, cooling water or unpolluted commercial process waters shall be permitted to enter any sanitary sewer by any device or method whatsoever. 

Violations of these sections are subject to administrative citations, fines, and/or disconnection of sanitary sewer service (CMMC 9.05 and 21.36).

It is important to inspect and confirm that your sump pump is not connected to the sanitary sewer system. If you are unsure, please contact Sanitary District No. 2 at (628)253-1158 for assistance.

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