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Water Conservation Payback Calculator
Water conservation reduces utility costs and compliance risk.
Payback years
5.3
Annual savings
$4,725
Combined water/sewer rate
$10.50
How the math works
Total rate = water + sewer. Savings = gallons / 1000 × rate. Payback = cost / savings.
$4.5 + $6 = $10.5 combined. 450k / 1k × $10.5 = $4.7k savings. $25k / $4.7k = 5.3 years payback.
How to Use
- Enter upgrade cost.
- Enter annual water savings gallons.
- Enter water rate per 1k gal.
- Enter sewer rate.
- Read payback.
Frequently Asked Questions
Fixture upgrades?
Low-flow toilets (1.6 to 0.8 gpf): 50% reduction. Low-flow shower heads: 30% reduction. Aerators on faucets: 25% reduction. Dual-flush toilets: 40% reduction. WaterSense-labeled products qualify for rebates.
Irrigation?
Smart controllers: 20-40% landscape water reduction. Drip irrigation: 50-70% vs sprinklers. Turf conversion (lawn to xeriscape): 50-80% reduction. Artificial turf: 100% reduction. Each approach has different install cost and visual.
Rebate programs?
Most utilities offer rebates: $25-300 per low-flow fixture. Irrigation upgrades: $0.50-2 per SF turf converted. Water audit: often free. PACE financing available. Combine to reduce net cost 30-50%.
How often should I rerun this?
Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.
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