Interactive Selector · 2026
Residential STP Selector
Find the right wastewater solution for your home. Tell us the home type, how many people live there and whether you want to reuse treated water — get a clear recommendation with a suggested capacity in KLD.
Estimated sewage generated → suggested plant capacity
Your home
On-site treatment usually required by the layout
Number of people living in the home — drives the flow at 135 LPCD.
Rounded up to a whole-KLD plant size
Matched to your home type and reuse choice
Sewage vs suggested capacity
Your home makes ≈0.6 KLD of sewage a day; a plant is sized just above that.
A Packaged MBR/MBBR plant sized at 1 KLD comfortably handles the daily flow with headroom for peak hours.
Treated water can be reused for flushing and gardens, cutting freshwater purchase.
How this works
- Municipal sewer available → connect to the sewer; no on-site plant is needed.
- Independent house on a large rural plot with no reuse → a septic tank + soak pit is usually enough.
- Otherwise → a packaged STP. A luxury villa (or any home wanting strong reuse) gets Packaged MBR/MBBR for polished, reusable water; others get Packaged MBBR / Extended Aeration.
- Suggested capacity = ⌈ residents × 135 LPCD × 80% return ÷ 1000 ⌉, minimum 1 KLD = 1 KLD.
Indicative guidance for concept planning per NBC/CPCB practice. Confirm soil percolation, local bye-laws and the final design with a qualified consultant before procurement.
Related Guides — Deep-dive reading
STP for Villas: Do You Need One, and Which Type Fits a Single Home?
When an individual villa actually needs a sewage treatment plant instead of a septic tank, the tiny capacities involved, and how to choose a compact MBBR or extended-aeration package that fits the plot, the budget and the garden.
Sewage Treatment PlantsSTP for Farmhouses: Off-Grid Wastewater Treatment & Reuse Guide
Farmhouses sit on big plots far from any municipal sewer, are used in bursts, and often run on weak or intermittent power. This guide covers the low-maintenance STP options that actually suit that reality — and how to reuse every drop for irrigation.
Sewage Treatment PlantsHome Lift Space Requirements (India): How Much Room a Home Elevator Really Needs
Footprint, clear shaft, pit and headroom by capacity (2/3/4/6 person), plus where to fit a lift in an Indian home plan.
Home Lifts & AccessibilityRelated Tools — You may also find these useful
BOD Load Calculator
Calculate the organic (BOD) load on an STP in kg/day and the removal efficiency required to meet discharge norms from flow and inlet/outlet BOD.
STP CalculatorHydraulic Retention Time (HRT) Calculator
Compute a reactor or tank's hydraulic retention time from its volume and daily flow, and benchmark it against recommended ASP, MBBR and SBR ranges.
STP CalculatorMBBR vs MBR Comparator
Weight seven decision criteria and get a scored recommendation between MBBR and MBR sewage-treatment technologies.
Comparator