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Committee hears bill to resolve conflict between septic permitting and subdivision rules
Summary
Representative Courtney Sprunger and public‑health officials told the committee House Bill 180 would grandfather legally permitted septic mixing zones and align local health permitting with state subdivision rules to avoid forcing property owners to abandon systems when dividing lots.
Representative Courtney Sprunger, sponsor of House Bill 180, told the Senate Local Government Committee the bill would reconcile a persistent conflict between local health rules for septic mixing zones and state subdivision law under Title 76.
“Most mixing zones are between several hundred feet,” Rachel Clark, testifying for environmental permitting, said, and “in most cases a well cannot be placed within a hundred feet of a mixing zone.” Clark and other proponents described cases in which drain fields legally permitted under local health regulations later became unusable for a property split because sanitation‑act rules tied to subdivision review required mixing zones to remain inside parcel boundaries.
The bill would grandfather septic systems that were legally permitted under local health rules, allow those mixing zones to continue to be used when a property is divided, and require that future permits issued under Title 50 keep mixing zones inside a parcel. Sprunger told the committee the effective date provision would allow systems previously approved by a county to proceed to Sanitation Act review; she said the bill’s changes would take effect on the bill’s effective date (the sponsor cited October 1 as the intended implementation date).
Several public‑health officials and county sanitarians supported the bill. Shannon Theriault, environmental health director at Missoula Public Health, representing the Montana Environmental Health Association, said the change “just makes a lot of sense” and reduces unexpected costs to property owners who lawfully installed systems under county review. Gallatin County’s land sanitarian (Krahn) and county reviewers said the bill clarifies confusion for both applicants and local reviewers.
Proponents and the sponsor said the measure follows interim work with the Department of Environmental Quality after a similar bill reached the governor last session and was vetoed; Sprunger told the committee DEQ concerns were addressed during the interim. County and consulting sanitarians at the hearing said the bill would prevent owners from being required to abandon legally permitted drainfields when they split property.
Committee members asked technical questions about how mixing zones are assessed and how direction of groundwater is determined; Clark described using potentiometric maps or monitoring wells to triangulate groundwater flow in most cases.
The hearing closed without a committee vote; supporters asked the committee to move the bill forward.
