By Justin Fox Clausen, Capital News Service
A new Senate bill would address the regulation, inspection and re-evaluation of septic systems.
If passed, Michigan would become the last state with a comprehensive septic code intended to prevent contamination of drinking water.
Megan Tinsley, the water policy director of the Michigan Environmental Council, said that past efforts to adopt a statewide code have failed.
Tinsley said a higher percentage of Michigan households rely on septic systems than the national average.
According to the Department of Environment, Great Lakes and Energy (EGLE), more than 1.3 million septic systems are used across the state to treat wastewater before returning it to the environment.
EGLE also estimates that at least 20% of those systems are failing.
Tinsley said that failing systems release up to 31 million gallons of wastewater per day into state waters, posing a threat to both humans and the environment.
Joan Rose, a microbiologist at Michigan State University who specializes in water microbiology, studies the impact of septic systems on diseases in the environment.
She said the waterborne pathogens introduced by septic tanks include E. coli, Salmonella and hepatitis A.
Rural communities across the state are at the highest risk, with many relying on groundwater and wells. A lack of regular inspections, especially at older homes, increases this risk.