Water Treatment Plant Sizing Calculator
Size a water treatment plant from population, per-capita demand, and peak factors. Estimate basin, filter, and clearwell dimensions.
Inputs
gpd
Results
Design Capacity
5.85 MGD
Estimated Capital Cost
$15,750,000
Average Daily Flow2.5 MGD
Peak Daily Flow4.5 MGD
Sedimentation Basin Area6,429 sq ft
Total Filter Area781 sq ft
Number of Filters2
Clearwell Volume188K gallons
Annual Operating Cost$945,000
Cost per 1,000 Gallons$1.04
Staff Required6
Site Footprint11.7 acres
How to Use This Calculator
- Enter Design Population and Per Capita Demand (gpd) — use projected 20-year population from your utility's master plan.
- Set Peak Day Factor to account for summer demand spikes (typically 1.5-2.5 for most utilities).
- Select Treatment Type (conventional, direct filtration, membrane, UV/chemical) based on source water quality.
- Choose Source Water Quality to apply appropriate pre-treatment requirements and complexity factors.
- Review Design Capacity (MGD), Average Daily Flow, and Peak Daily Flow to confirm the plant meets demand.
- Use Estimated Capital Cost and Sedimentation Basin Area to support preliminary engineering reports and bond applications.
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