Septic Tank / STP Sizing

Sizes a septic tank from the four volumes Philippine regulation adds together, then suggests inside dimensions and the split between its two chambers. It also says when the population is large enough to need advanced treatment instead.

• Sedimentation, sludge digestion, digested sludge storage and scum volumes.
• The total required tank volume.
• Suggested inside dimensions and the two-chamber split.
• Whether the population passes the threshold for advanced treatment.
• Follows: Department of Health Administrative Order 2019-0047; PD 856 (Code on Sanitation), Chapter XVII and its implementing rules; Revised National Plumbing Code, Annex B; Department of Environment and Natural Resources effluent standards.
• Soil, water table and distance from wells decide where a tank can go and how its effluent is treated. Those need a site check.

• Water Demand and Tank Size Calculator
• Roof Drain and Storm Drainage Calculator
• Pneumatic Waste Collection Calculator
• Step-by-step guide: Septic Tank / STP Sizing