Septic system requirements in Clatsop County, Oregon
The septic rules landplan.io applies in Clatsop County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Clatsop County
Oregon's state rules apply in Clatsop County: landplan.io has no county rules of its own here. State rules: Reviewed See Oregon's rules
Septic systems allowed in Clatsop County
The system types landplan.io permits in Clatsop County:
- Standard Subsurface Systems
- Pressure Distribution System
- Drip systems
- Bottomless Sand Filter Systems
Septic tank size in Clatsop County
The daily design flow of a home: 75 gal/day per bedroom, at least 300 gal/day. The septic tank is sized from that flow:
| Daily design flow | Minimum tank |
|---|---|
| up to 240 gal/day | 1,000 gallons |
| 240 to 360 gal/day | 1,500 gallons |
| 360 to 600 gal/day | 2,000 gallons |
| 600 to 720 gal/day | 2,500 gallons |
| 720 to 840 gal/day | 2,750 gallons |
| 840 to 920 gal/day | 3,000 gallons |
| 920 to 1,040 gal/day | 3,250 gallons |
| Bedrooms | Daily design flow |
|---|---|
| 1 | 300 gal/day |
| 2 | 300 gal/day |
| 3 | 375 gal/day |
| 4 | 450 gal/day |
| 5 | 525 gal/day |
| 6 | 600 gal/day |
| 7 | 675 gal/day |
| 8 | 750 gal/day |
| 9 | 825 gal/day |
| 10 | 900 gal/day |
| 11 | 975 gal/day |
| 12 | 1,050 gal/day |
| 13 | 1,125 gal/day |
| 14 | 1,200 gal/day |
| 15 | 1,275 gal/day |
Septic setbacks in Clatsop County
| From | To | Distance |
|---|---|---|
| LineString | Groundwater Interceptors slope 3% or less | 20 Ft |
| LineString | Groundwater Interceptors slope greater than 3% Downgradient | 50 Ft |
| LineString | Groundwater Interceptors slope greater than 3% Upgradient | 10 Ft |
| LineString | Intermittent Streams | 20 Ft |
| LineString | Irrigation Canals Lined (watertight canal) : Downgradient | 25 Ft |
| LineString | Irrigation Canals Unlined: Downgradient | 50 Ft |
| LineString | Irrigation Canals Unlined: Upgradient | 25 Ft |
| LineString | Underground Utilities | 10 Ft |
| LineString | Water line | 10 Ft |
| Point | Groundwater Supplies and Wells | 100 Ft |
| Point | Springs Downgradient | 100 Ft |
| Point | Springs Upgradient | 50 Ft |
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Clatsop County. Confirm a design with the Oregon health department or your county's before you build.
Parcel data in Clatsop County
landplan.io has parcel boundaries for Clatsop County (98.8% of its area): type an address and the design starts from the parcel.
Septic companies, designers and jobs in Oregon
Where the rules come from
The regulations and documents landplan.io's Clatsop County, Oregon rules are read from:
- OAR 340 Division 71 - Onsite Wastewater Treatment Systems (current text from OARD) (OAR 340-071)
- OAR 340-071-0800 - Division 71 Tables (Table 1 Minimum Separation Distances and the other tables)
Near Clatsop County
- Columbia County
- Tillamook County
- Washington County
- Yamhill County
- Multnomah County
- Polk County
- Clackamas County
- Marion County
- All of Oregon
Questions
What septic systems are allowed in Clatsop County?
landplan.io designs by Oregon's state rules there and permits: Standard Subsurface Systems, Pressure Distribution System, Drip systems and Bottomless Sand Filter Systems.
What size septic tank do I need in Clatsop County?
landplan.io sizes the septic tank in Clatsop County from the daily design flow: up to 240 gal/day: 1,000 gallons; 240 to 360 gal/day: 1,500 gallons; 360 to 600 gal/day: 2,000 gallons; larger flows need larger tanks. A home's design flow is 75 gal/day per bedroom, at least 300 gal/day.
How far must a septic system be from a well in Clatsop County?
landplan.io keeps these distances in Clatsop County: Point to groundwater supplies and wells: 100 Ft.
Does landplan.io have parcel data for Clatsop County, Oregon?
Yes: parcel boundaries cover Clatsop County (98.8% of its area).