Bolthole Index

Mercer County, Ohio

Building permits, zoning and septic rules in the Village of Coldwater, Ohio

The Village of Coldwater, Ohio has its own zoning ordinance covering all of the incorporated village, and a zoning officer issues zoning permits for new buildings and changes of use1. Septic permits for Mercer County addresses come from the Mercer County Health District, not the village2. We could not confirm who issues building-code permits inside the village, so ask the village office before you build.

At a glance

Zoning
Yes: a village zoning ordinance covers all of incorporated Coldwater1
Zoning permit
Required from the village zoning officer before building, excavating or changing a use3
Building-code permit
Ohio has statewide residential and nonresidential codes; who enforces them inside Coldwater is not confirmed, so ask the village office4
Septic permits
Mercer County Health District (county, not village)2
RV living
RV parks only in the planned development district, with zoning board of appeals approval; RVs on individual lots not confirmed5
Floodplain
A flood plain (FP) district restricts development6

Who to call

Zoning

Village of Coldwater Zoning Officer

Issues zoning permits and enforces the village zoning ordinance

Also useful

Village of Coldwater Administration

Village office; the place to ask who the current zoning officer is and who handles building-code questions

419.678.4881

610 W. Sycamore Street, Coldwater, Ohio 45828

Septic permits

Mercer County Health District

Household sewage treatment system siting, lot approvals, permits, operation and maintenance review, and nuisance investigations

(419) 586-3251

220 W Livingston St, Suite B152, Celina, Ohio 45822

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 Village of Coldwater means bringing your own water and power. The kit we’d start with:

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Does Coldwater, Ohio have zoning, and what does it mean for RVs and manufactured homes?

Yes. The Village of Coldwater adopted a zoning ordinance for all of the incorporated area of the village1. Districts include R-1 rural residential, R-2 suburban residential, R-3 urban residential, PD planned development and FP flood plain, plus commercial and industrial districts7.

Recreational vehicle parks and mobile home parks are listed as planned-development uses that need zoning board of appeals approval58. We could not confirm whether an RV may be lived in on an ordinary residential lot or how individual manufactured homes are treated in the other districts, so ask the village zoning officer before you buy or place one5.

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

A zoning permit is required. Application is made to the village zoning officer before constructing, excavating for a foundation, changing a use or structurally altering any building, including accessory buildings3. The zoning officer issues the permit when the ordinance has been followed3.

Whether the village also runs its own building-code review and inspections is not something we could confirm. Ohio adopts separate residential and nonresidential building codes statewide, enforced by certified municipal, township or county building departments4. Call the village office at 419.678.4881 to ask which department reviews plans for a new home9.

How do septic permits work in Coldwater?

Septic permitting in Mercer County runs through the Mercer County Health District, which handles septic siting, building lot approvals and permits under Ohio law2. Statewide, no one may install a new or replacement system or alter an existing one without an installation or alteration permit from the board of health10.

The village zoning ordinance says that where central water or sewage disposal is not available or not used, the county board of health is asked to set the minimum lot area before a zoning permit issues3. We could not confirm whether a given village lot is on public sewer, so ask the Health District and the village office together.

What about flood plain and wells inside Coldwater?

Land in the village's FP flood plain district is meant for areas that may be subject to periodic flooding, and development there is restricted to minimize damage to life, health and property6. Check the village zoning map for your parcel.

Private water systems such as wells require a permit under Ohio rules11. We could not confirm village rules on well use inside the village, so ask the village office.

Building a home in Coldwater: the steps, in order

  1. Confirm the parcel's zoning district with the village office7.
  2. Ask the village office whether a building-code permit is also required and who reviews plans.
  3. Apply to the village zoning officer for a zoning permit3.
  4. If the lot is not on public sewer, get lot review and a septic permit from the Mercer County Health District12.
  5. Check the flood plain district if the parcel is low-lying6.

What stays with Mercer County, and what to check before you buy

Land outside village limits follows Mercer County's rules, not Coldwater's; see the Mercer County page for unincorporated land. Septic permits and health-district review stay with the county for every address2.

Mercer County's effective property tax rate is 1.1%13. Typical county soils rarely rate well for conventional drain fields, so expect a soil evaluation14. Zoning details such as lot sizes and setbacks were not confirmed for the village, so get the district table from the zoning officer.

Watch-outs

  • The village zoning ordinance we reviewed is Ordinance No. 1661 from August 2017, and later amendments were not checked, so confirm current district rules with the village office1.
  • A planned development district use such as an RV park or mobile home park requires zoning board of appeals approval, so it is not an automatic right5.
  • County zoning rules apply only to unincorporated Mercer County, not inside Coldwater15.

Sources

  1. Coldwater, Ohio Zoning Ordinance No. 1661 (August 2017) (Village of Coldwater), quoted and re-checked
  2. Household Sewage Treatment Systems – Mercer County Ohio Health District, quoted and re-checked
  3. Village of Coldwater Zoning Officer (villageofcoldwater.com)
  4. Section 3781.10 | Board of building standards - powers and duties (Ohio statewide rule), quoted and re-checked
  5. Coldwater, Ohio Zoning Ordinance No. 1661 (August 2017) (Village of Coldwater), quoted and re-checked
  6. Coldwater, Ohio Zoning Ordinance No. 1661 (August 2017) (Village of Coldwater), quoted and re-checked
  7. Coldwater, Ohio Zoning Ordinance No. 1661 (August 2017) (Village of Coldwater), quoted and re-checked
  8. Coldwater, Ohio Zoning Ordinance No. 1661 (August 2017) (Village of Coldwater), quoted and re-checked
  9. Village of Coldwater Administration (villageofcoldwater.com)
  10. Rule 3701-29-09 - Site review and permits for STS installation and operation, quoted and re-checked
  11. Chapter 3701-28 | Private water systems (Ohio statewide rule), quoted and re-checked
  12. Household Sewage Treatment Systems, quoted and re-checked
  13. Effective property tax rate: Bolthole Index county data
  14. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  15. Mercer County Zoning Code, quoted and re-checked

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.

Answers from the rulebook for Village of Coldwater

Village of Coldwater’s own rules

  • Local zoningPresent

    All incorporated area of Coldwater village

    • Ordinance No. 1661, dated August 2017; page hosted on the village website, later amendments not checked
    “ordinance providing for the establishment of zoning for all of the incorporated area of coldwater, ohio”
  • Zoning districtsPublished

    Zoning districts inside Coldwater village

    • Districts include R-1 rural residential, R-2 suburban residential, R-3 urban residential, PD planned development, FP flood plain, PW public works, plus commercial and industrial districts
    “(pd) planned development for projects that either are unique in use or are not provided for in other zoning districts.”
  • Living in an RVLimited

    Recreational vehicle parks inside Coldwater village (planned development district)

    • Requires zoning board of appeals approval; occupancy of RVs on individual lots not resolved
    “pd, planned development (requires zoning board of appeals approval) permitted uses mobile home parks and recreational vehicle parks large recreational complexes having several types of recreational uses”
  • Manufactured homesLimited

    Mobile home parks inside Coldwater village; individual manufactured homes in other districts not resolved

    • Requires zoning board of appeals approval in the planned development district
    “pd, planned development (requires zoning board of appeals approval) permitted uses mobile home parks and recreational vehicle parks large recreational complexes having several types of recreational uses”
  • Building in a floodplainLimited

    Land in the FP flood plain district inside Coldwater village

    • District purpose statement only; specific FP permitted uses not extracted
    “(fp) flood plain for areas which may be subject to periodic flooding; development should be restricted so as to minimize the potential for loss of life or health and damage to public and private property.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Village of Coldwater or Mercer County directly.

  • Building permit — Building permits inside Coldwater village
  • Owner-builder exemption — Owner-builder exemption inside Coldwater village
  • Building code adopted — Building code inside Coldwater village
  • Inspections — Building inspection inside Coldwater village
  • Certificate of occupancy — Certificate of occupancy inside Coldwater village
20 more unanswered
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Subdividing land
  • Driveway access
  • Short-term rentals
  • Permit fees
  • Permit process

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

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

← All of Mercer County: county rules, score and offices