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Chino Valley staff brief commissioners on state ADU and subdivision-plat mandates; implementation questions remain
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Summary
Town of Chino Valley planning staff briefed commissioners Oct. 7 on two new state laws — HB2928 (changes to accessory dwelling units) and HB2447 (administrative review of subdivision plats) — and described open questions about implementation, public‑health impacts, and local rule changes.
Town of Chino Valley planning staff spent the bulk of the Oct. 7 Planning and Zoning Commission meeting reviewing two state bills that require changes to local rulemaking: HB2928, governing accessory dwelling units (ADUs), and HB2447, which makes subdivision preliminary and final plats subject to administrative review rather than automatic public hearings and council action except where a zoning change is requested.
Will (planning staff) told commissioners that HB2928 would, as written in the most recent version staff reviewed, allow by‑right additional ADUs on single‑family lots (one attached plus one detached by right and a potential fourth unit on lots of 1 acre or larger), and that earlier drafts included a 75,000‑population exemption that created uncertainty. Town attorneys reviewed the language and advised the town that the updated bill language — which places an apparent population cap reference later in the text — means Chino Valley (population under 75,000) is not required to adopt the ADU mandate at this time. Still, staff warned the commission to expect possible future legislative actions that could reduce the exemption threshold over time.
Why it matters: HB2928 could alter where and how many additional dwelling units homeowners can build, potentially affecting septic/water capacity, road access and neighborhood character in parts of Chino Valley that are not on municipal water or sewer. Staff noted the town could, under public‑health and safety authority, limit ADU eligibility to properties connected to municipal water and sewer or to parcels that meet required ingress/egress standards. The bill also limits municipalities’ ability to impose certain fees (except sewer/water connection fees) and parking or road impact conditions related to ADUs.
Staff concerns and clarifications: Planning staff and commissioners discussed septic capacity in rural subdivisions, referencing past nitrate problems in Chino Meadows that required a sewer project. Staff said county health department rules control septic permitting and that the town would still control building permits; however, implementation issues (addresses, meters, parking, setbacks, lot coverage, and stormwater/drainage) would need local guidance if the law applies. A commissioner asked whether lot coverage and setbacks would be superseded for ADUs; staff said lot coverage rules for ADUs would be struck if the statute applied to the town.
HB2447 implications: Staff described HB2447 as a shorter bill with large procedural impacts: after Jan. 1, municipalities must handle subdivision plats (preliminary and final) via administrative review, eliminating routine council public hearings on plats unless a zoning change is involved. The town still retains authority to deny plats and the denial can be appealed; appeal processes would restore a public hearing at the Planning and Zoning Commission and potentially Town Council. Staff said the town will prepare a UDO text amendment to comply with the Jan. 1 deadline and aims to present it to Planning and Zoning in December so the council can act before the statutory deadline, subject to staffing and holiday calendar constraints.
What the town plans to do: Staff said it will draft a UDO text amendment to implement the administrative review requirements and is considering local measures (for example: limiting ADU applicability to properties on municipal water/sewer, requiring adequate ingress/egress, or establishing enforcement/monitoring rules). The town also plans a zoning code rewrite (18‑month timeline anticipated) and intends to address livestock and other local code priorities early next year.
Ending: Commissioners expressed concern about state preemption, potential erosion of local zoning control, and the practical implications for septic, roads and neighborhood meetings. Staff said they will return with proposed text amendments and implementation plans, and that the commission should expect to see a Planning and Zoning text‑amendment packet in December.

