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Plat Review Policy



This policy establishes procedures for the review and subsequent approval of plats in Clark County. The Clark County Health Department is authorized by the Plat Act (765 ILCS 205/2) to review the proposed plat with respect to sewage disposal systems if any of the platted land will not be served by a public sewer system. Neither county nor municipal officials may approve the plat until written approval is obtained by the Clark County Health Department with respect to the private sewage disposal system.

Upon receipt of the proposed plat, the sanitarian will review the plat within 15 working days. The developer and the respective county or municipal authority will be advised of the results of the review in writing. If the review determines that the proposed plat does not adequately address the private sewage disposal systems, a detailed explanation of the deficient areas will be provided.

The plat will be reviewed to determine if private sewage disposal systems could be installed on each lot in accordance with the Private Sewage Disposal Code. It is not the intent of this policy to require the developer to provide complete designs for a private sewage disposal system on each lot. The licensed private sewage disposal contractor will do this when the house is constructed. Lot size, soil characteristics, surface drainage patterns, and location of water supplies all affect the design of private sewage disposal systems.

To facilitate the review of the plat, the following information must be submitted:

1. Proposed plat.

2. Subdivision covenants.

3. A soil investigation that consists of at least one soil boring from each lot. The investigation shall be conducted in accordance with Section 905.55a of the Private Sewage Disposal Code. A percolation test on each lot may be submitted in lieu of the soil investigation.

4. A statement of the availability of public sewer service (Section 905.20e), a statement describing the availability of a public water supply and if available, the location of the water mains.

5. The location of existing and proposed drainage tiles, natural drainage areas, ponds or lakes.

6. A statement on the potential for flooding based on field observations and historical review [Section 905.20(j)(1)].


If it is determined that a septic tank with a subsurface seepage field disposal system cannot be installed

on a lot, then a detailed description of the proposed effluent disposal method must be submitted verifying disposal in accordance with Section 905.110 of the Private Sewage Disposal Code. If it is proposed to dispose of the effluent to the ground surface, then a method to reduce the amount of effluent from leaving the property must be described in the plan in accordance with the Clark County Sewage Ordinance.

Further, if it is proposed to discharge the effluent to a common collector and the common collector will carry a flow in excess of 1500 gallons per day, then the developer must obtain a construction permit for the common collector and a National Pollutant Discharge Elimination System Permit from the Illinois Environmental Protection Agency and submit copies of such permits to the Department. Should a developer fail to submit the information necessary for this review, the county or municipal authority will