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Floods stress septic systems, may lead to damage or failure

Wednesday, October 22, 2003

KING COUNTY, WASHINGTON - Heavy rains and floods put stress on septic systems, and the 100,000 King County households on septic "on-site sewage" systems should be on the lookout for tell-tale signs of trouble following the big storm this week.

"When drainfields become saturated with water, they can't efficiently drain the wastewater from the holding tank" said Barbara Wright, Manager of Wastewater at Public Health - Seattle & King County. "Poor drainage may mean slow fixture drainage, sewage back-up or even total system failure."

What to do during a major rain or flood:

  • Eliminate all non-essential water use
  • Reduce toilet flushing
  • If your drainfield is covered with water, do not use the system until the water has receded
  • Avoid contact with sewage if there is a sewage back-up. Contaminated water can cause disease

Call an OSS (on-site sewage) professional immediately if you notice any of these problems:

  • Water on the drainfield that does not subside after the rain stops
  • A bad odor/sewage smells
  • Wastewater backs up into house
  • Slow running drains, especially after laundry loads
  • Sewage surfacing anywhere

Typical winter rains and even additional seasonal water use add extra stress to septic systems that may lead to premature system failure or costly repairs. A well-maintained septic system is better able to withstand the stresses of heavy rains or flooding.

Take advantage of these tips for optimal system functioning:

  • Get the septic tank pumped every 3-5 years
  • Hire an On-site System Maintainer to regularly monitor your OSS
  • Reduce water use to minimize impact on drainfield
  • Don't use a garbage disposal
  • Don't use septic additives
  • Use "eco-friendly" household cleaners
  • Flush only toilet paper
  • Run full loads of dishes and laundry and spread usage throughout the week

More information about OSS operation and maintenance may be found at: www.kingcounty.gov/health/wastewater

Providing effective and innovative health and disease prevention services for over 1.8 million residents and visitors of King County, Public Health – Seattle & King County works for safer and healthier communities for everyone, every day.

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