Celina, OH Zoning, Building Permits & Septic Rules

Celina, Ohio, in Mercer County, has its own zoning, and a zoning permit is required before construction inside city limits¹. The city's engineering department handles zoning permit applications¹. Septic permits come from the Mercer County Health District, not the city². Rules for land outside the city are the county's³.

At a glance

Zoning: Yes: Celina has its own zoning ordinance with residential, business and industrial districts⁴
Zoning permit: Required before construction; issued through the city engineering department¹
Mobile homes: Only in a mobile home park in the R-3 district⁵
RV living: Parking limited on residential streets and front yards; long-term living not confirmed⁶
Septic: Mercer County Health District handles septic permits²
Commercial and 4+ unit buildings: Need state-level building permitting in addition to zoning¹

Who to call

Zoning

City of Celina Engineering Department (planning and zoning)

Zoning permit applications, zoning questions, setbacks and planning inside Celina city limits

419-586-1144

711 Hierholzer Street Celina, Ohio 45822

Septic permits

Mercer County Health District

Household sewage treatment system siting, lot approvals and septic permits for Mercer County

(419) 586-3251

Contact details are copied from each office’s official page and were checked against it on October 14, 2026.

Off-grid gear

Going off-grid in Celina means bringing your own water and power. The kit we’d start with:

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Does Celina, Ohio have zoning?

Yes. Celina's own zoning ordinance sets districts S-1, R-1, R-2, R-3, R-O, B-1, B-2, B-3, M-1 and M-2 inside city limits⁴. The city describes itself as a zoned community and says zoning controls height, setbacks and use¹.

For RVs, the city's code prohibits parking motor homes, camping trailers and trailers on residential streets or in front yards for more than 48 hours, while unoccupied units may sit in rear and side yards⁶. The section we read does not address living in an RV long term, so ask the engineering department before assuming it is allowed⁶.

Mobile homes may be located in Celina only in a mobile home park in the R-3 district, as a conditional use⁵. A park needs at least 5 acres and 3000 square feet per mobile home⁵. Buildings may not exceed 100 feet without planning commission approval⁷.

Do you need a building permit in Celina, and who issues it?

A zoning permit is required in Celina before construction begins, and the application is handled by the city's engineering department¹. The city's posted zoning fee for a single-family dwelling is $40¹.

Beyond zoning, commercial and industrial buildings and residential buildings of four units or more require state permitting through the Miami County building regulations department, according to the city¹. We could not confirm from the city's code whether a separate residential building permit and inspection apply to a single-family house inside Celina; ask the engineering department which office reviews plans and inspects a new house¹.

If the parcel is outside city limits, the Mercer County Zoning Code and its zoning permit apply instead⁸.

How do septic permits work in Celina, Ohio?

Septic permits for Mercer County, including septic siting and lot approval, are handled by the Mercer County Health District under Ohio's household sewage treatment rules². Ohio requires an installation permit from the board of health before a new or replacement system is installed⁹.

Inside a city, the first question is whether public sewer is available. Ohio rules require connection to a publicly owned sewer when it is accessible and available¹⁰. We could not confirm Celina's own sewer connection rules, so ask the engineering department whether a given lot is served before you plan a septic system¹. For a lot that needs a septic system, call the Mercer County Health District¹¹.

What stays with Mercer County, and what should you check before buying in Celina?

Septic permits and wells stay with the Mercer County Health District and the state, not the city². Ohio requires a permit for constructing a private water system¹². Land outside Celina's limits falls under the county zoning code, which is Mercer County's page³.

Before buying, confirm the district on the city zoning map, the sewer and water availability, and whether the parcel sits in a flood zone, which requires a separate flood development approval¹. Mercer County's effective property tax rate is¹³ percent, with a median bill of $¹⁴ a year, so the county's figures apply to a Celina address¹³.

Building a home in Celina: the steps, in order

Confirm the lot's zoning district with the engineering department¹.
Ask the engineering department how sewer service and plan review work for your lot¹.
If no public sewer is available, get the soil evaluation and septic permit from the Mercer County Health District².
Apply for the zoning permit before starting construction¹.
Confirm separately whether state building permitting applies to your project type¹.

Watch-outs

Celina's code on RVs we read does not say whether you may live in an RV on a lot; confirm with the engineering department before moving one onto a lot⁶.
Whether Celina issues or requires a separate residential building permit for a single-family house is unconfirmed; ask the engineering department¹.
Search results often show Mercer County's unincorporated zoning code, which does not apply inside Celina city limits³.

Sources

Written October 14, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Unanswered questions are usually a sign that Celina publishes no rule on the point, not that none exists. Mercer County’s page lists the county offices to call.

Zoning, building permits and land rules in Celina, Ohio