Rainwater Harvesting: Dearborn vs Detroit
How do rainwater harvesting rules compare between Dearborn, MI and Detroit, MI?
Dearborn and Detroit have similar restriction levels.
Dearborn, MI
Wayne County
Rainwater harvesting for outdoor irrigation is legal in Dearborn with no state prohibition; indoor potable or non-potable use must comply with Michigan plumbing code and EGLE cross-connection rules.
View full Dearborn rules →Detroit, MI
Wayne County
Rainwater harvesting is legal in Detroit with no state permit required; GLWA (Great Lakes Water Authority) combined sewer system makes rain barrels a proven CSO-reduction tool, and DWSD offers periodic rain barrel distribution programs.
View full Detroit rules →Key Facts Comparison
| Fact | Dearborn | Detroit |
|---|---|---|
| Rain barrels | Legal, no permit under 100 gal | - |
| Outdoor use | No restrictions | - |
| Indoor plumbing tie-in | Permit required | - |
| Backflow prevention | Required for indoor use | - |
| Potable use | Not approved | - |
| State Law | - | Legal, no permit |
| Sewer System | - | GLWA combined |
| CSO Concern | - | Storm + sanitary mix |
| City Program | - | DWSD GSI discount |
| Indoor Use | - | Requires licensed plumber |
Highlighted rows indicate differences between cities.
Dearborn FAQ
Can I install a rain barrel in Dearborn?
Yes. Standard rain barrels for garden use are legal and do not require permits. Cover them to prevent mosquitoes.
Can I use rainwater to flush toilets?
Only with a permitted plumbing system including backflow prevention. Consult a licensed plumber and the building department.
Detroit FAQ
Do I need a permit to install a rain barrel in Detroit?
No. Michigan has no permit or registration requirement for residential rain barrels used for outdoor irrigation. DWSD actively encourages them to reduce CSO events.
Can I use harvested rainwater indoors for flushing toilets?
Only if installed by a licensed plumber per Michigan Plumbing Code with an RPZ backflow preventer and no cross-connection to potable supply. Outdoor irrigation uses require no plumbing approval.
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