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MIMINNESOTA POLLUTION CONTROL AGtrMCY WWW.pce.state,171mus e ( ................ ._ _ ........ _ .............................. _. ...._.. Compliance Iinspections for subsurface sewage treatment systems Learn about inspections For new and existi ng se ptic systems Subsurface sewage treatment system (55TS) compliance inspections are conducted for:. Newly installed systems — To determine. if the design and installation meet current rule requirements; and if the system will protect public health and: Min iinize:effects on groundwater: s Existing systems -- To determine whether the system is functioning properly to protect public health and groundwater. Existing.system inspections do.not check for.system size, .ho.rizontaI setbacks (i.e., property lines, wells, and buildings), estimated longevity, current usage; .or.past system abuse. Individuals conducting compliance inspections must be. certified by the Minnesota Pollution. Control Agency and either operate under an S.STS. inspection business license, or act:as a qualified employee of a local government. Compliance criteria Existing system inspection The main emphasis in. inspecting existing systems is if: 1) the 5STS is an imminent threat to.public health or safety (ITPHS), or 2) the system is failing to protect groundwater (FTPGW) by not adequately removing pathogenic organisms before reaching groundwater: Existing systems inust.also remain 1n coiripI!ance.with issued operating permits if applicable. ultimately, all existing systems.must meet the..provisions.specified in Minn. R.7080.1500..subp. 4. Systems. are considered imminent threats to public safety if they:. • Discharge sewage to the surface (e.g.; overflow pipes,:seepfng areas in the yard, connected to agricultural drain tile) • Chronically backup sewage into the connectedhomes o.r businesses • Are. unsafe (e.g.,. those with cracked tank.1ids or improper electrical wiring) Systems that fail to protect groundwater include: Seepage pits, cesspools; or other types of pits • Tanks that crack and.lea k below their operating depth • Inadequate layers -of suitable soil between the soil dispersal system and bedrock or periodically saturated soil (also called the season:al.water table) Other conditions besides those listed above may cause systems to fail compliance inspections. Existing system inspections also must check.for system failures. that could lead to theunsafe.conclitions, such as pluggedsoil treatment systems; electrical failures of pumps, switches, or.floats; and pipe problems. It's not .necessary to do soil borings to determine the depth ofsuitable soil if past soil.borings have been verified for accuracy..In older systems, th.e suitable soil depth was not always verified,. and some existing system Iinspections may reveal that the: depth of suitable soil has been inadequate since the system's installation.. Minnesota Pollution Control Agency ; June 2019 1 wq-wwists439 BI-296-6300 1800-657-3864 or useyourpreferred relay service I Info•oca@-state_rnn.us ; Available in alternative formats.