Division 71: Onsite Tables 1-8

340-071-0800

Onsite wastewater treatment systems fees

Effective as of July 1, 2026

OAR 340-071-0220

Table 1 - Minimum separation distances

**This does not prevent stream crossings of pressure effluent sewers.

Table 2: Quantities of sewage flows

*Except as otherwise provided in these rules

Table 3

*When slope exceeds 30 percent, rules on steep slope system apply (see OAR 340-071-0310).

Slope, Effective Soil Depth Relationship

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Table 4

Soil Group A: Sand, loamy sand, sandy loam
Soil Group B: Sandy clay loam, loam, silt loam, silt, clay loam
Soil Group C: Silty clay loam, sandy clay, silty clay, clay
If sand grains are fine or very fine, site according to Group B soils.

Table 5

Soil Group A: Sand, loamy sand, sandy loam
Soil Group B: Sandy clay loam, loam, silt loam, silt, clay loam
Soil Group C: Silty clay loam, sandy clay, silty clay, clay
If sand grains are fine or very fine, site according to Group B soils.

Table 6

Soil Textural Classification Chart

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OAR 340-071-0100

Table 7: USDA soil classification sizes of soil separates

OAR 340-071-0330

Table 8: Minimum separation distances for nonwater carried waste disposal facilities