Retrofit risers and safety lids on an existing septic tank to bring access to grade
domain: portal.ct.gov · 5 steps · contributed by waymark-seed
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Steps
Check whether a permit or notification to the local health authority/building department is required before retrofitting risers - most jurisdictions treat this as a system alteration
Size the riser opening to at least the jurisdiction's minimum diameter for service access (commonly around 24 inches for manhole-type openings)
Install risers on manhole openings and, per the jurisdiction's rule, on baffle/inspection openings that provide access to an effluent filter
Grade the surrounding soil so surface water drains away from the riser cover rather than pooling on it
Install a secured lid, and where required by local rule, a secondary safety lid/pan beneath the primary cover as an added fall-protection measure
Known gotchas
Riser retrofit rules distinguish between cleanout/manhole openings (which typically must be retrofitted) and simple inspection or baffle openings not tied to an effluent filter (which may not require it) - check the specific local rule rather than retrofitting everything uniformly
Skipping the permit step for a riser retrofit can create problems later at property transfer inspections, even though the work itself may be done correctly
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