Canton, GA rainwater: 44,175 gallons off a roof
Canton, GA: gallons off the roof each year
44,175gallons a year
That is a 1,500 sq ft asphalt roof under Canton, GA's normal 55.6 inches of rain, about 795 gallons for every inch that falls.
In Canton, GA a single barrel does most of the work. Storms come often enough that a small tank refills before it runs dry, and a bigger one would mostly sit full.
Rainfall: NOAA 1991-2020 climate normals, the Canton station (2.9 mi away). Canton, GA ranks 12th wettest of the 101 cities covered in Georgia.
Month by month in Canton
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 5.12 | 4,069 | |
| Feb | 5.02 | 3,990 | |
| Mar | 5.42 | 4,308 | |
| Apr | 4.41 | 3,505 | |
| May | 3.72 | 2,957 | 79 |
| Jun | 4.11 | 3,267 | 30 |
| Jul | 5.19 | 4,125 | |
| Aug | 5.12 | 4,069 | |
| Sep | 4.20 | 3,338 | 19 |
| Oct | 3.49 | 2,774 | 107 |
| Nov | 4.36 | 3,465 | |
| Dec | 5.42 | 4,308 |
Mar is the wettest month (5.42 in, 4,308 gal off the roof); Oct the driest (3.49 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Canton
Best fit: one 55-gallon barrel, which delivers about 189 gallons to the garden in a normal year (80.6% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Canton's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 189 | 42,757 |
| 110 gal | 189 | 42,757 |
| 165 gal | 189 | 42,757 |
| 275 gal | 189 | 42,757 |
| 550 gal | 189 | 42,757 |
| 1,000 gal | 189 | 42,757 |
| 1,500 gal | 189 | 42,757 |
| 2,500 gal | 189 | 42,757 |
| 5,000 gal | 189 | 42,757 |
Simulated storm by storm through a normal year using the station's count of days with 0.1 in or more of rain each month.
Is rainwater collection legal in Georgia?
Legal. Outdoor irrigation use is unrestricted; indoor non-potable systems must follow Appendix I 'Rainwater Recycling Systems' of the Georgia amendments to the state plumbing code. No state storage cap; potable use depends on local rules.
Checked against the current source on 2026-11-06. Source