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Chapter 246-272B WAC

Last Update: 5/26/11

LARGE ON-SITE SEWAGE SYSTEM REGULATIONS

WAC Sections

PART 1: GENERAL PROVISIONS
Purpose and objectives.
Acronyms and definitions.
Applicability and relationship to other statutes and regulations.
General requirements.
PART 2: APPROVAL AND PERMITTING PROCESS
Subpart A - New Construction
Site reviewPredesign report, soil characterization, and site inspection.
Environmental reviewSite risk survey and hydrogeology report.
Engineering.
LOSS 14,500 gpd and belowOperating permit application and approval to construct.
LOSS greater than 14,500 gpdOperating permit application.
LOSS greater than 14,500 gpdPublic notice.
LOSS greater than 14,500 gpdOperating permit and approval to construct.
Construction.
Subpart B - First Department Operating Permit for Existing LOSS
LOSS constructed on or before July 1, 1984.
LOSS with current permit from department of ecology or local health jurisdiction.
LOSS constructed after July 1, 1984, without current operating or discharge permit.
Subpart C - Permitted LOSS
LOSS modifications.
Operating permit renewals.
Operating permit requirements and conditions.
PART 3: SITE AND ENVIRONMENTAL REVIEW REQUIREMENTS
Subpart A - Site Review
Site reviewPredesign report.
Site reviewInspection.
Subpart B - Environmental Review
Environmental reviewSite risk survey.
Environmental reviewHydrogeology report.
Subpart C - Site Standards
Soil characterization.
Minimum land area.
PART 4: ENGINEERING REQUIREMENTS
Engineering report.
Management plan.
Operations and maintenance manual.
Monitoring and reporting plan.
Plans and specifications.
PART 5: CONSTRUCTION REQUIREMENTS
Installer qualifications and responsibilities.
Construction oversight and testing.
Water tightness testing of sewage tanks.
Department final inspection.
Post-construction documentation.
PART 6: DESIGN AND TECHNICAL STANDARDS
Subpart A - General Requirements
General design requirements.
Horizontal setbacks.
Vertical separation.
Design flows.
Sewage characterization.
Treatment.
Drainfields.
Design requirements to allow monitoring and maintenance.
Sewage tanks.
Collection, conveyance, and other piping appurtenances.
Subpart B - Specific Technologies
Public domain and proprietary technologies.
Pressure distribution.
Subsurface drip systems.
Sand-lined trenches and beds.
Intermittent sand filters.
Recirculating gravel filters.
Cesspools and seepage pits.
Holding tank sewage systems.
PART 7: LOSS OPERATIONS REQUIREMENTS
Subpart A - Routine Operations
Management requirements.
Operations and maintenance requirements.
Department inspections.
Reliability and emergency response.
Operator qualifications and responsibilities.
Metering.
Sewage tank management.
Subpart B - LOSS Changes
Modifications.
Failures.
Abandonment.
Connection to a sanitary sewer system.
PART 8: WAIVERS, ENFORCEMENT, AND APPEALS
Waivers.
Enforcement.
Notice of decision, appeals, and adjudicative proceedings.
Third-party appeals to department permit decisions for LOSS over 14,500 gpd and adjudicative proceedings.
PART 9: SEVERABILITY
Severability.