OAR 340-071-0340
Holding Tanks

(1) Criteria for approval. Except as section (5) of this rule provides, installing a holding tank system requires a construction-installation or WPCF permit. A construction-installation permit may be issued for sites that meet all the following conditions.
(a) Permanent use.
(A) The site cannot be approved for installation of a standard subsurface system.
(B) No community or area-wide sewerage system is available or expected to be available within five years.
(C) The tank is intended to serve a small industrial or commercial building or an occasional use facility such as a county fair or a rodeo.
(D) Unless DEQ allows otherwise, the projected daily sewage flow is not more than 200 gallons.
(E) Setbacks required for septic tanks can be met.
(b) Temporary use: A holding tank may be installed in an area under the control of a city or other legal entity authorized to construct, operate, and maintain a community or area-wide sewerage system if:
(A) The application for permit includes a copy of a legal commitment from the legal entity to extend a community or area-wide sewerage system meeting the requirements of this division to the property covered by the application within five years from the date of the application; and
(B) The proposed holding tank complies with other applicable requirements in OAR chapter 340, divisions 071 and 073.
(2) Operations and maintenance. At all times the holding tank is being used, the tank’s owner must maintain a service contract with a sewage disposal service licensed under OAR 340-071-0600 (Sewage Disposal Service Licenses) to provide for regularly inspecting and pumping the holding tank.
(3) Design and construction requirements. Except as provided in section (5) of this rule, holding tanks must comply with the following requirements:
(a) Plans and specifications for each holding tank proposed to be installed must be submitted to the agent for review and approval.
(b) Each tank must:
(A) Have a minimum liquid capacity of 1,500 gallons;
(B) Comply with tank standards in OAR 340-073-0025 (Tank Construction);
(C) Be located and designed to facilitate removal of contents by pumping
(D) Be equipped with both an audible and a visual alarm placed in locations acceptable to the agent to indicate when the tank is 75 percent full. Only the audible alarm may be user cancelable;
(E) Have no overflow vent at an elevation lower than the overflow level of the lowest fixture served; and
(F) Be designed for antibuoyancy if test hole examination or other observations indicate seasonally high groundwater may float the tank when empty.
(4) Special requirements. The application for a holding tank permit must include:
(a) A copy of a contract with a licensed sewage disposal service that requires the tank to be pumped periodically at regular intervals or as needed and the contents treated in a manner and at a facility the agent approves; and
(b) Evidence that the owner or operator of the proposed treatment facility will accept the pumpings for treatment.
(5) Portable holding tanks may be temporarily placed at sites having limited duration events such as county fairs or construction projects or at temporary restaurants if the following requirements are met:
(a) The tanks must be owned and serviced by a licensed sewage disposal service with sewage pumping equipment having a 550-gallon or larger tank and meeting all other requirements in OAR 340-071-0600 (Sewage Disposal Service Licenses)(11).
(b) Tank placement and use must comply with all local planning, building, and health requirements.
(c) Only domestic sewage may be discharged into the tank.
(d) The tank must be maintained in a sanitary manner to prevent a health hazard or nuisance.
(e) The tank must not be buried.
(f) A person may not use the tank to serve a dwelling, recreation vehicle, or any other structure having sleeping accommodations, except that a portable holding tank may be used temporarily to serve a contractor’s job shack or night watchman’s trailer.
(g) The tank must meet the following standards:
(A) The tank must be watertight with no overflow vent lower than the overflow level of the lowest fixture served.
(B) Tank capacity may not exceed 1,000 gallons unless otherwise authorized by the agent.
(C) The tank must be structurally sound and made of durable, noncorrosive materials.
(D) The tank must be designed and constructed to provide a secure, watertight connection of the building sewer pipe.
(E) The tank must be marked with the name and phone number of the licensed sewage disposal service responsible for maintaining the tank.

Source: Rule 340-071-0340 — Holding Tanks, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-071-0340.

340‑071‑0100
Definitions 340‑071‑0110
Purpose 340‑071‑0115
Technical Review Committee 340‑071‑0120
Jurisdiction and Policy 340‑071‑0130
General Standards, Prohibitions and Requirements 340‑071‑0135
Approval of New or Innovative Technologies, Materials, or Designs for Onsite Systems 340‑071‑0140
Onsite System Fees 340‑071‑0150
Site Evaluation Procedures 340‑071‑0155
Existing System Evaluation Report 340‑071‑0160
Permit Application Procedures — Construction, Installation, Alteration, and Repair Permits 340‑071‑0162
Permit Application Procedures — WPCF Permits 340‑071‑0165
Permit Denial Review — Construction-Installation, Repair, Alteration Permits 340‑071‑0170
Pre-Cover Inspections 340‑071‑0175
Certificate of Satisfactory Completion 340‑071‑0185
Decommissioning of Systems 340‑071‑0200
Prior Construction Permits or Approvals 340‑071‑0205
Authorization to Use Existing Systems 340‑071‑0210
Alteration of Existing Onsite Wastewater Treatment Systems 340‑071‑0215
Repair of Existing Systems 340‑071‑0220
Standard Subsurface Systems 340‑071‑0260
Alternative Systems, General 340‑071‑0265
Capping Fills 340‑071‑0275
Pressurized Distribution Systems 340‑071‑0280
Seepage Trench System 340‑071‑0285
Redundant Systems 340‑071‑0290
Conventional Sand Filter Systems 340‑071‑0295
Conventional Sand Filter Design and Construction 340‑071‑0302
Recirculating Gravel Filter (RGF) 340‑071‑0310
Steep Slope Systems 340‑071‑0315
Tile Dewatering System 340‑071‑0320
Split Waste Method 340‑071‑0325
Gray Water Waste Disposal Sumps 340‑071‑0330
Nonwater-Carried Systems 340‑071‑0335
Cesspools and Seepage Pits 340‑071‑0340
Holding Tanks 340‑071‑0345
Alternative Treatment Technologies (ATTs) 340‑071‑0360
Absorption Trenches in Saprolite 340‑071‑0400
Geographic Area Special Considerations. 340‑071‑0410
Rural Area Consideration 340‑071‑0415
For Cause Variances 340‑071‑0420
Hardship Variances 340‑071‑0425
Variance Officers 340‑071‑0430
Variance Hearings and Decisions 340‑071‑0435
Variance Permit Issuance, Inspections, Certificate of Satisfactory Completion 340‑071‑0440
Variance Appeals 340‑071‑0445
Variance Administrative Review 340‑071‑0460
Moratorium Areas 340‑071‑0500
Community Systems 340‑071‑0520
Large Systems 340‑071‑0600
Sewage Disposal Service Licenses 340‑071‑0650
Training and Certification Requirements for System Installers and Maintenance Providers 340‑071‑0800
Tables
Last Updated

Jun. 8, 2021

Rule 340-071-0340’s source at or​.us