Calculator · reviewed July 24, 2026

Catchment Maintenance Cost Planner

Estimate recurring filter, ultraviolet, testing, cleaning, pump, roof, gutter, and delivered-water reserves for a Hawaiʻi catchment system.

Use actual local prices

Estimate the annual system reserve

Cost per replacement filter set

Replace this starting value with your actual bill, quote, or estimate.Filter-set changes per year

times

Replace this starting value with your actual bill, quote, or estimate.UV lamp, sleeve, or service per year

Replace this starting value with your actual bill, quote, or estimate.Water testing budget per year

Replace this starting value with your actual bill, quote, or estimate.Tank cleaning cost when performed

Replace this starting value with your actual bill, quote, or estimate.Years between budgeted cleanings

years

Replace this starting value with your actual bill, quote, or estimate.Roof, gutter, and inlet maintenance

Replace this starting value with your actual bill, quote, or estimate.Pump and pressure-system reserve

Replace this starting value with your actual bill, quote, or estimate.Emergency delivered-water reserve

Replace this starting value with your actual bill, quote, or estimate.

Transparent method

Formula

Annual estimate = filter-set cost × changes + annual UV/service + testing + annualized tank cleaning + roof/gutter work + pump reserve + emergency water reserve.

Health boundary

What the number cannot decide

The result does not determine whether water is safe, whether treatment is adequate, or which testing schedule applies. Use current DOH and UH guidance, laboratory results, equipment instructions, and qualified advice.

Related tools

Pair this with sizing and records

Use the catchment sizing calculator for storage planning and the testing and maintenance plan for recurring records.