2025-07-09 On-site septic 2Lewis County Code Chapter
8.40 Amendments
An abbreviated guide through the proposed changes
Lewis County Public Health and Social Services
Draft Changes; Sections with Minor Changes
or New Sections
•Minor Changes
•8.40.040: Definitions
•8.40.070: Connection to Public Sewer System
•8.40.080: Sewage Technologies
•8.40.160: Soil and Site Evaluation
•8.40.180: Design Requirements –Septic Tank Sizing
•8.40.200: Design Requirements –Facility Operation, Monitoring, and Maintenance
•8.40.260: Operation, Monitoring, and Maintenance –Food Service Establishment
•8.40.280: Expansions
•8.40.290: Abandonment
•8.40.340: Waiver of State Regulations
•8.40.350: Enforcement
•New Sections
•8.40.010: Purpose, objectives, and Authority
•8.40.050: Local Management and Regulation
•8.40.185: Design Requirements –Pump Chamber Sizing
•8.40.265: Remediation
•8.40.275: Minor Repair of Malfunctions (not needing a permit)
Draft Changes; Removed and Updated
Sections
•Removed sections:
•8.40.095: Transition from the list of approved systems and products to the registered list –Treatment products
•8.40.105: Transition from the list of approved systems and products to the registered list –Bacterial reduction
•8.40.125: Transition from the list of approved systems and products to the registered list –Distribution Products
•8.40.135: Transition from the experimental system program to application for product registration
•Updated Sections based on new standards, mechanisms, and clarity around processes for new products
•8.40.100: Bacterial Reduction
•8.40.110: Proprietary distribution productions –Registration
•8.40.120: Proprietary distribution production registration –Process and requirements
•8.40.130: Production development permits
•8.40.085 and 8.40.090 Proprietary treatment products
Draft Changes; Changes to Guidance Tables
•8.40.150: Location, Table IV Minimum Horizontal Separations; new separation items added to table
•8.40.190: Design Requirements –Soil Dispersal Components, Table VIII Hydraulic Loading Rates, allows for smaller drainfields if the effluent is treated to a higher treatment level
•8.40.270: Repair of Failures
•Table IX Options and Methods to Address an OSS Failure
•Table X Treatment Component Performance Levels for Repair of OSS Not Meeting Vertical and Horizontal Separations (only to be used for repairs)
•8.40.310: Developments, Subdivisions, and Minimum Land Area Requirements,
•Table XI, Minimum Land Area Requirement for Each Single-Family Residence or Unit Volume of Sewage: increases the minimum land area required for each unit volume of sewage
•Table XII Maximum Allowable Total Nitrogen Load Per Day by Type of Water Supply, Soil Type and Land Area (replacing Method II Justification for smaller lot size)
•See demo of Onsite Septic Program Tool