What Does a County Surveyor Do in Indiana?

A county surveyor in Indiana keeps the official records of property corners and legal surveys, reviews subdivision plats, and acts as the technical authority over every regulated drain in the county. The office is elected in all 92 counties, and most residents only cross paths with it for one of two reasons: a boundary question with a neighbor, or a drainage problem on their land.

Keeping the County’s Corner Records

Every property line in Indiana ultimately traces back to a survey corner, and the county surveyor is the custodian of those corners. The office maintains a corner record book with an index and record of every original government survey corner in the county, plus outline maps showing where each corner sits within each section, grant, tract, and subdivision.¹

Each entry has to describe the corner’s location, the physical monument marking it, distance and bearing measurements to at least three permanent objects, the date of the last inspection, the surveyor who checked it, and the method used. The surveyor must physically check and reference at least five percent of all corners in the record book every year, which cycles the whole county through inspection roughly every twenty years.¹ Private licensed surveyors can also submit their corner findings to be added to the book.

Many counties have converted older paper records into digital databases, and the surveyor oversees that transition. When digital records and modern field data disagree, the original field notes and Public Land Survey System documents are treated as the baseline.

Settling and Recording Boundary Lines

A separate legal survey record book holds every legal survey made in the county, with outline maps detailed enough to show the approximate location of each survey.² This is the book the office pulls when neighbors can’t agree on where a line runs.

The process to legally establish a boundary doesn’t start at the county office. The landowner hires a private licensed surveyor, who must notify all adjoining landowners by registered or certified mail at least twenty days before beginning work. After the survey, the private surveyor marks and monuments the lines and corners with durable materials, then files a plat and proof of notice with the county surveyor, who enters it in the legal survey record book.²

The county office is the repository and the checkpoint. New survey lines must tie into corners already recorded in the corner record book, so the two systems reinforce each other. If markers have been destroyed or moved, the surveyor can reset them based on the official records.

Reviewing Subdivision Plats

Before a new subdivision plat is recorded, it needs a certificate from a professional surveyor confirming the plat is correct, including a metes-and-bounds description of its location.³ The county surveyor reviews submitted plats for compliance with state and local rules, checking that proposed lot divisions align with existing property lines and don’t collide with recorded easements or rights-of-way.

Some Indiana property records go back to the early 1800s, and old ambiguities often only surface when someone tries to split or develop a parcel. When the review turns up a conflict, the surveyor works with the landowner, title company, or attorney to clean it up before the plat is recorded.

Authority Over Regulated Drains

The surveyor’s drainage role is the one that catches people off guard. Indiana statute makes the county surveyor the technical authority over every regulated drain in the county, with five duties written into the code:⁴

Investigating all regulated and proposed drains and preparing the reports, plans, profiles, and specifications needed for any construction, reconstruction, or maintenance.
Publishing standards for drain design, construction, and maintenance, drawing on sources that include Purdue University, the U.S. Department of Agriculture, and the Army Corps of Engineers.
Supervising all construction, reconstruction, and maintenance on regulated drains.
Cataloging and maintaining the surveying notes, plans, profiles, and specifications for regulated drains, and for mutual and private drains when those records are available.
Handling functions related to urban drains under the office’s jurisdiction.

The surveyor sits on the county drainage board as an ex officio, nonvoting member.⁵ The board makes the formal decisions on drain projects and approves the assessments charged to benefitting landowners, but the engineering assessments, cost estimates, and recommendations behind those decisions come from the surveyor.

Reconstruction vs. Periodic Maintenance

If you own land along a regulated drain, this classification controls what you’ll be billed. A drain needs reconstruction when it can no longer perform its designed function, no longer matches its original plans, or when conditions have changed enough to require major modifications such as converting an open drain to a tiled one, increasing tile size, deepening a channel, or extending the drain’s length. Periodic maintenance covers routine work: cleaning, spraying, removing obstructions, and minor repairs that restore the drain to its intended function.⁶ The surveyor classifies the work, and that classification is the difference between a modest maintenance assessment and a much larger reconstruction bill.

Drainage Review for New Projects

Any proposed construction or land alteration near an existing regulated drain gets reviewed by the surveyor. The office looks at drainage plans to make sure new development won’t divert water in ways that cause erosion, flooding, or damage next door. If a project doesn’t meet the standards, the surveyor can require changes before it moves ahead.

Appealing a County Survey

If you disagree with a survey done through the county surveyor’s office, you have 180 days to appeal to the county’s circuit, superior, or probate court.⁷ The clock runs from the survey itself, and missing the deadline generally ends the appeal option, so act promptly if something looks wrong.

Once an appeal is filed, the surveyor must immediately send copies of the relevant field notes and papers to the court. No appeal bond is required.⁷ The court can take evidence from other surveys of the same property, so if you hired your own private surveyor and got different results, that competing survey can come in.

If the court rules against the original survey, it can order a new one by a different qualified person. The court then determines the true boundary lines and corners and orders the county surveyor to mark them with durable monuments placed below the frost line, record the findings in the official field notes, and perpetuate the corrected boundaries going forward.⁷ The court-ordered survey can itself be appealed under the same process.

Who Actually Signs the Work

Each of Indiana’s 92 counties elects a surveyor to a four-year term. The position is established by the state constitution, which puts it alongside the auditor, recorder, and sheriff as a core county office. If the elected surveyor is a licensed professional land surveyor under Indiana’s surveyor registration law, that person directly runs the corner perpetuation program and the other technical duties. If the elected surveyor is not licensed, the law requires them to appoint a registered land surveyor, with county executive approval, to handle those functions.¹ Either way, a licensed professional is always behind the technical work the office puts its name on.

1
Indiana General Assembly. Indiana Code 36-2-12-11 – Administration of Section; Maintenance of Corner Record Book; Contents of Record; Procedure for Establishment and Perpetuation of Corners
2
Indiana General Assembly. Indiana Code 36-2-12-10 – Maintenance of Legal Survey Record Book; Procedure for Establishing Location of Line; Notice; Effect of Location and Establishment of Lines; Appeal
3
Indiana General Assembly. Indiana Code 36-7-3-2 – Subdivision Plats
4
Indiana General Assembly. Indiana Code 36-9-27-29 – County Surveyors Powers and Duties
5
Indiana General Assembly. Indiana Code 36-9-27 – Drainage Law
6
Indiana General Assembly. Indiana Code 36-9-27-34 – Classification of Drains by County Surveyor
7
Indiana General Assembly. Indiana Code 36-2-12-14