Laundry with Harvested Rainwater in South Carolina

Using harvested rainwater for laundry in South Carolina is a practical way to reduce your water bill and conserve municipal supplies. With 49.8 inches of average annual rainfall, a 1,500-square-foot asphalt shingle roof in South Carolina can collect approximately 35,885 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 35,885 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 South Carolina

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 2,841 930 +1,911
February 2,542 840 +1,702
March 3,140 930 +2,210
April 2,392 900 +1,492
May 2,691 930 +1,761
June 3,738 900 +2,838
July 4,037 930 +3,107
August 3,888 930 +2,958
September 3,289 900 +2,389
October 2,542 930 +1,612
November 2,243 900 +1,343
December 2,542 930 +1,612

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 South Carolina for laundry (calculated for 2 people).

Roof Area Annual Harvest Demand Met Rec. Tank Savings/Year
1,000 sq ft 23,924 gal 100.0% 2,500 gal $54.75
1,500 sq ft 35,885 gal 100.0% 5,000 gal $54.75
2,000 sq ft 47,846 gal 100.0% 5,000 gal $54.75
2,500 sq ft 59,806 gal 100.0% 10,000 gal $54.75

Setting Up Rainwater Harvesting for Laundry in South Carolina

Using rainwater for laundry in South Carolina 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 South Carolina

Upgrading to a metal roof increases your collection efficiency from 80% (asphalt shingle) to 95%, boosting your annual harvest to 42,612 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 South Carolina

Explore how harvested rainwater can serve other needs in South Carolina:

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 South Carolina or compare all 50 states.