Laundry with Harvested Rainwater in Missouri

Using harvested rainwater for laundry in Missouri is a practical way to reduce your water bill and conserve municipal supplies. With 42.2 inches of average annual rainfall, a 1,500-square-foot asphalt shingle roof in Missouri can collect approximately 30,651 gal per year. laundry requires roughly 15 gallons per day per person, year-round. With this setup, rainwater can meet approximately 100.0% of your laundry needs, saving an estimated $54.75 per year.

Annual Harvest 30,651 gal 1,500 sq ft roof
Annual Demand 10,950 gal laundry (2 people)
Demand Met 100.0% of laundry
Rec. Tank 5,000 gal storage capacity

Monthly Supply vs. Demand for Laundry in Missouri

The table below shows how your monthly rainwater harvest compares to laundry demand throughout the year. Green values indicate months where your harvest exceeds demand (surplus water for tank storage), while red values show months where you will draw down your stored reserves. Laundry is a year-round use, so demand remains constant regardless of season. Tank sizing should bridge the gap during your driest months.

Month Harvest (gal) Demand (gal) Balance
January 1,495 930 +565
February 1,645 840 +805
March 2,392 930 +1,462
April 2,990 900 +2,090
May 3,588 930 +2,658
June 3,140 900 +2,240
July 2,841 930 +1,911
August 2,542 930 +1,612
September 2,691 900 +1,791
October 2,542 930 +1,612
November 2,542 900 +1,642
December 2,243 930 +1,313

Harvest by Roof Size for Laundry

A larger roof collection area directly increases your harvest and the percentage of laundry demand you can meet with rainwater. The table below shows how different roof sizes perform in Missouri for laundry (calculated for 2 people).

Roof Area Annual Harvest Demand Met Rec. Tank Savings/Year
1,000 sq ft 20,435 gal 100.0% 1,500 gal $54.75
1,500 sq ft 30,651 gal 100.0% 5,000 gal $54.75
2,000 sq ft 40,869 gal 100.0% 5,000 gal $54.75
2,500 sq ft 51,085 gal 100.0% 10,000 gal $54.75

Setting Up Rainwater Harvesting for Laundry in Missouri

Using rainwater for laundry in Missouri offers a unique benefit: rainwater is naturally soft, meaning you can use 30-50% less detergent while achieving the same or better cleaning results. Hard municipal water requires more soap to lather effectively, and mineral deposits can make fabrics stiff and dull over time. A rainwater-fed laundry system requires the same setup as toilet flushing — dedicated non-potable plumbing, a pump-and-pressure system, and sediment plus carbon filtration to remove any debris or tannins that could discolor fabrics. The filtration requirements are slightly higher than for toilet use because you want to protect both your clothing and your washing machine from fine sediment. A first-flush diverter on your collection system is especially important for laundry use to keep water clean.

Metal Roof Upgrade: Laundry in Missouri

Upgrading to a metal roof increases your collection efficiency from 80% (asphalt shingle) to 95%, boosting your annual harvest to 36,398 gal from a 1,500-square-foot roof. This increases your laundry demand coverage to 100.0% and raises annual savings to $54.75. Metal roofs also last 40-70 years compared to 20-30 years for asphalt shingle, and their smooth surface sheds debris more effectively, reducing maintenance on your collection system and improving water quality.

Other Uses for Rainwater in Missouri

Explore how harvested rainwater can serve other needs in Missouri:

Get Your Custom Estimate

Use our Rainwater Harvesting Calculator to enter your exact roof area, material, and combine multiple uses for a comprehensive harvest analysis. See all rainwater harvesting data for Missouri or compare all 50 states.