Bolthole Index

Monroe County, Illinois

Zoning, building permits and septic rules in Waterloo, Illinois

Waterloo, Illinois adopts its own zoning code and reviews building permit applications for zoning compliance through its zoning administrator12. Building inspections run through the city's building inspector at City Hall3. Where no public sewer is available, the city code requires a written city permit for a private septic system4. Land outside city limits falls under Monroe County.

At a glance

Zoning
City zoning code (Chapter 40), enforced by the zoning administrator1
Building permit
Required; the zoning administrator reviews each application for zoning compliance2
Inspections
City building inspector; 48 hours' notice needed3
Minimum home size
1,800 sq ft in R-1; 1,400 sq ft in R-2; 1,000 sq ft one- and two-family in other districts567
Septic
Written city permit required where no public sewer is available4
Sewer connection
Required within 90 days of notice if public sewer is within 150 feet8

Who to call

Building permits

City of Waterloo Building Inspection

Building permit processing, construction inspections and building code guidance inside Waterloo city limits

618-939-8600 ext. 208

100 West Fourth Street, Waterloo, Illinois 62298

Zoning

City of Waterloo Zoning Office

Zoning questions, guidance on applying for a building permit and plan review inside Waterloo city limits

618-939-8600 ext. 300

100 West Fourth Street, Waterloo, Illinois 62298

Septic permits

Monroe County Health Department — Environmental Health

Private sewage disposal and well questions in Monroe County

618-939-3871 ext. 212

[email protected]

1315 Jamie Lane, Waterloo, IL. 62298

Contact details are copied from each office’s official page and were checked against it on October 23, 2026.

Off-grid gear

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

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Does Waterloo, Illinois have zoning?

Yes. The City of Waterloo in Monroe County zones land inside its limits under its own Chapter 40 Zoning Code, and the zoning administrator enforces it1. The code names R-1, R-2, R-3, R-4 and R-5 residential districts and B business districts9.

Minimum home size depends on the district. In R-1 single-family districts, any dwelling must have at least 1,800 square feet of living area5. In R-2, the minimum is 1,400 square feet6. In other districts, one- and two-family homes need 1,000 square feet and apartments 750 square feet, and the zoning board of appeals may grant a variance down to 800 square feet for one- and two-family homes7. Those minimums rule out most tiny homes in Waterloo's residential districts.

A lot of record under 5,000 square feet can take a dwelling only with a special use permit10. We could not confirm setbacks, lot coverage or height limits, or any rule on RVs, tiny homes or accessory dwellings; ask the zoning office11.

Do you need a building permit in Waterloo, Illinois?

Yes. Waterloo reviews each building permit application for zoning compliance before approval, and the permit must be issued before construction starts2. The city's zoning administrator also has the power to inspect buildings and land uses for compliance with the zoning code12.

We could not confirm which building code the city has adopted, the permit fee schedule, whether a certificate of occupancy is required for a new home, or any owner-builder exemption. The city's building inspector and zoning office can answer those311. Waterloo's building inspection page says inspections are carried out under the Illinois building codes3.

Who issues building permits in Waterloo, and how do you reach them?

Inside Waterloo city limits, the city handles building permits, inspections and zoning; the county planning counter is not the right office for a city address. The building inspector's office states that it inspects construction for compliance with the Illinois building codes3. The zoning office offers guidance on applying for a building permit and reviews and approves construction plans11.

Call the building inspector at 618-939-8600 ext. 208 or the zoning office at 618-939-8600 ext. 300; both are at 100 West Fourth Street, Waterloo, Illinois 62298311. Inspections need 48 hours' notice to the building inspector3.

How do septic permits work in Waterloo, Illinois?

Most Waterloo lots connect to public sewer. When the public sewer is within 150 feet of the nearest property line, a house must connect within 90 days after official notice8.

Where no public sanitary sewer is available, the building sewer must connect to a private sewage disposal system that complies with Chapter 38, Article III of the city code13. The owner must first obtain a written permit signed by the city before construction starts4. The discharge is also subject to state public health approval14.

Monroe County's Environmental Health office issues private sewage permits elsewhere in the county15. We could not confirm whether it also reviews systems inside Waterloo, so ask the Monroe County Health Department before you design a system16. Private wells inside the city are also unconfirmed.

Can you live in an RV or tiny home in Waterloo, Illinois?

We could not confirm. No RV, temporary camping, tiny home or accessory dwelling rule inside Waterloo city limits was located, so do not assume any of them is allowed. The 1,800 and 1,400 square foot minimums for R-1 and R-2 districts apply to any type of dwelling56. Ask the zoning office for the district of the specific parcel and what it allows11.

Outside city limits the answer comes from Monroe County, not Waterloo; see the Monroe County page.

Building a home in Waterloo: the steps, in order

  1. Look up the parcel's zoning district with the zoning office and check the minimum home size for that district115.
  2. Ask whether public sewer is within 150 feet; if so, plan to connect8.
  3. If no sewer is available, get a written city permit for a private system and confirm the county health department's role416.
  4. Apply for the building permit; the zoning administrator reviews it for zoning compliance2.
  5. Give the building inspector 48 hours' notice for each inspection3.
  6. Ask the building office whether a certificate of occupancy is required before you move in3.

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

Septic and well questions run through the Monroe County Health Department in the county, so confirm its role for any city address16. Monroe County's own zoning and building rules cover unincorporated land and are on the Monroe County page; they do not govern a parcel inside Waterloo's limits that the city zones itself1.

County-level numbers: Monroe County's effective property tax rate is 1.7%17, and the median property tax bill is $4,523 a year18. Floodplain, driveway and fee rules inside the city are unconfirmed; ask the zoning office about any low-lying lot11.

Watch-outs

  • Waterloo's minimum home sizes are large for a residential lot: 1,800 square feet in R-1 and 1,400 square feet in R-256.
  • We could not confirm the city's building code adoption, permit fees, setbacks, flood rules or RV and tiny home rules; call the city building inspector or zoning office before buying311.
  • A private septic permit inside Waterloo comes from the city, and whether the county health department also reviews it is unconfirmed; ask the Monroe County Health Department416.

Sources

  1. Waterloo, IL Code Chapter 40 Zoning Code - Article I General Provisions (sections 40-1-8, 40-1-9) (Waterloo), quoted and re-checked
  2. Waterloo, IL Code Chapter 40 Zoning Code - Article I General Provisions (sections 40-1-8, 40-1-9) (Waterloo), quoted and re-checked
  3. City of Waterloo Building Inspection (waterloo.il.us)
  4. Waterloo, IL Code Chapter 38 Utility Systems - Article III Sewers (sections 38-3-6 to 38-3-13) (Waterloo), quoted and re-checked
  5. Waterloo, IL Code Chapter 40 Zoning Code - Article XII Miscellaneous Provisions (sections 40-12-1 to 40-12-3) (Waterloo), quoted and re-checked
  6. Waterloo, IL Code Chapter 40 Zoning Code - Article XII Miscellaneous Provisions (sections 40-12-1 to 40-12-3) (Waterloo), quoted and re-checked
  7. Waterloo, IL Code Chapter 40 Zoning Code - Article XII Miscellaneous Provisions (sections 40-12-1 to 40-12-3) (Waterloo), quoted and re-checked
  8. Waterloo, IL Code Chapter 38 Utility Systems - Article III Sewers (sections 38-3-6 to 38-3-13) (Waterloo), quoted and re-checked
  9. Waterloo, IL Code Chapter 40 Zoning Code - Article XII Miscellaneous Provisions (sections 40-12-1 to 40-12-3) (Waterloo), quoted and re-checked
  10. Waterloo, IL Code Chapter 40 Zoning Code - Article XII Miscellaneous Provisions (sections 40-12-1 to 40-12-3) (Waterloo), quoted and re-checked
  11. City of Waterloo Zoning Office (waterloo.il.us)
  12. Waterloo, IL Code Chapter 40 Zoning Code - Article I General Provisions (sections 40-1-8, 40-1-9) (Waterloo), quoted and re-checked
  13. Waterloo, IL Code Chapter 38 Utility Systems - Article III Sewers (sections 38-3-6 to 38-3-13) (Waterloo), quoted and re-checked
  14. Waterloo, IL Code Chapter 38 Utility Systems - Article III Sewers (sections 38-3-6 to 38-3-13) (Waterloo), quoted and re-checked
  15. Monroe County Health Department - Private Sewage Disposal Systems (2026 county census)
  16. Monroe County Health Department — Environmental Health (monroecountyhealth.org)
  17. Effective property tax rate: Bolthole Index county data
  18. Median property tax bill: Bolthole Index county data

Written October 23, 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 Waterloo

Waterloo’s own rules

  • Building permitRequired

    Building permit applications for land inside Waterloo city limits; the zoning administrator reviews them for zoning code compliance

    • The excerpt establishes zoning-compliance review of building permit applications; building-code permit steps in Chapter 6 were not read
    • Construction may proceed only after the permit is issued
    “examine any application for a building permit, or any other application pertaining to the use of land, buildings, or structures, and approve said application for zoning code compliance when, in all respects, it conforms with the provisions of the zoning code.”
  • InspectionsLimited

    Inspections of buildings and land uses inside Waterloo city limits, for zoning compliance

    • The cited power is a zoning-code inspection power; building-code inspections in Chapter 6 were not read
    “conduct such inspections of buildings, structures and uses of land as are necessary to determine compliance with the terms of this code.”
  • Local zoningPresent (with conditions)

    Land inside Waterloo city limits, which the city zones under its own Chapter 40 Zoning Code

    • Use permissions and district rules are in Chapter 40 Articles II-XIII; only the administration sections were read
    “the enforcement of this zoning code is hereby vested in the zoning administrator.”
  • Zoning districtsPartial

    Zoning districts of the city of Waterloo, Illinois

    • Districts named in the code include R-1, R-2, R-3, R-4, R-5 and B districts; the full district list (Article II) was not opened
    “minimum area to be reserved for usable recreation space per dwelling unit shall be limited to 300 square feet in the r-2, r-3, r-4 and r-5 zoning districts”
  • Minimum dwelling sizeSpecified

    Residences and apartment units in all other zoning districts inside Waterloo city limits (not R-1 or R-2)

    • Board of zoning appeals may grant a variance to not less than 800 square feet of living area for one- and two-family residences if statutory findings are met (section 40-12-1(c)(1))

    minimum dwelling unit size, one-family and two-family residences: 1000 square feet (variance floor 800 square feet) · minimum apartment unit size: 750 square feet

    “the zoning board of appeals may grant a variance to not less than 800 square feet of living area for residences, including one-family and two-family dwellings, if the requested variance:”
    2 more reviewed findings on this topic
  • Minimum lot sizeSpecified

    Lots of record existing on the effective date of the zoning code, inside Waterloo city limits, proposed for a dwelling

    • Applies only to lots of record; district-specific minimum lot area for new lots was not located
    • Lots of record under 5,000 square feet need a special use permit

    lot of record area for dwelling by right: >= 5000 square feet (other code requirements must still be met)

    “(d) a lot of record below 5,000 square feet may be improved with a dwelling only if special use permit is granted.”
  • Who permits septicMixed (with conditions)

    Private sewage disposal systems on lots inside Waterloo city limits where no public sanitary sewer is available

    • The city code requires private systems to comply with Chapter 38 Article III; discharges are also subject to approval by the state department of public health
    • Health-district or county septic permitting inside city limits was not checked
    “where a public sanitary sewer is not available under the provisions of § 38-3-6, the building sewer shall be connected to a private sewage disposal system complying with the provisions of this chapter.”
  • Septic permitRequired

    Private sewage disposal systems inside Waterloo city limits where no public sewer is available

    • Permit requirement taken from the Chapter 38 table of contents; section 38-3-9 body was not read
    • Issuing office and fees not established
    “before commencement of construction of a private sewage disposal system, the owner shall first obtain a written permit signed by the city.”
  • Off-grid sanitationLimited

    Buildings inside Waterloo city limits where no public sanitary sewer is available under section 38-3-6

    • Allowed only as a private sewage disposal system complying with Chapter 38 Article III
    • Septic discharge subject to state department of public health approval
    “where a public sanitary sewer is not available under the provisions of § 38-3-6, the building sewer shall be connected to a private sewage disposal system complying with the provisions of this chapter.”
  • Mandatory utility hookupSewer (with conditions)

    Houses and buildings for human occupancy inside Waterloo city limits that abut a street, alley or right-of-way with a public sanitary or combined sewer

    • Connection required only where the public sewer is within 150 feet of the nearest property line
    • Connection due within 90 days after official notice
    • Where no public sewer is available, a private system applies (section 38-3-7)
    • No water connection rule was located; water code is article IV of chapter 38, not read

    distance to public sewer for mandatory connection: <= 150 feet · connection deadline after official notice: 90 days

    “is hereby required at his or her expense to install suitable toilet facilities therein and to connect such facilities directly with the proper public sewer in accordance with the provisions of this code within 90 days after the date of official notice to do so, provided that said public sewer is within 150 feet of the nearest property line.”
  • Subdividing landRegulated (with conditions)

    Division of land inside Waterloo city limits

    • Existence of Chapter 34 Subdivisions shown in the code table of contents; approval steps were not read
    “chapter 34: subdivisions chapter 36: taxation chapter 38: utility systems”
  • Permit processPartial

    Zoning-compliance review of building and other land-use permit applications inside Waterloo city limits

    • Only the zoning administrator's review role was read; building-code permit steps not established
    “examine any application for a building permit, or any other application pertaining to the use of land, buildings, or structures, and approve said application for zoning code compliance when, in all respects, it conforms with the provisions of the zoning code.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Waterloo or Monroe County directly.

  • Owner-builder exemption — Owner-builder exemption inside Waterloo city limits
  • Building code adopted — Building code adoption inside Waterloo city limits
  • Certificate of occupancy — Certificate of occupancy for new dwellings inside Waterloo city limits
  • Setbacks — Front, side and rear setbacks in the R-1 single-family residence district inside Waterloo city limits
  • Lot coverage — Lot coverage in the R-1 single-family residence district inside Waterloo city limits
13 more unanswered
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

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 Waterloo publishes no rule on the point, not that none exists. Monroe County’s page lists the county offices to call.

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