Household Sewage Treatment SystemsThis program covers septic system siting, building lot approvals, septic system permitting, review of system operation and maintenance, and nuisance investigations. Regulations governing septic systems require soil evaluations on any new building lot, prior to existing system replacement, and at the time of minor subdivision parcel split-offs. Septic system types and sizes are determined by the type and condition of soil found on the individual properties. Mercer County HSTS regulations
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