Florida uses 2× the national average water per capita. Greywater reuse can cut your water bill by ~30% — but Florida law has strict installation rules.
Florida Greywater Definition
Florida Statute §381.0065 defines greywater as domestic wastewater from specific household fixtures — excluding toilet waste (blackwater) and kitchen sources that harbor food pathogens. Greywater typically makes up 50–80% of total household wastewater.
- ✅ Clothes washing machine discharge
- ✅ Shower and bathtub drain water
- ✅ Bathroom lavatory (hand-washing) sinks
- ❌ Kitchen sink — food contamination risk
- ❌ Dishwasher effluent — high grease and detergent load
- ❌ Toilet waste — classified as blackwater
- ❌ Utility sink water — cleaning chemical contamination
- ❌ Diaper washing — pathogen contamination
Key Rule: Florida residential greywater systems are restricted to subsurface irrigation only. Surface spray contact with air is prohibited for untreated greywater regardless of system size under FAC 64E-6.
Permit Thresholds — Department of Health
Florida Administrative Code Rule 64E-6 establishes the regulatory framework. The key threshold is 400 gallons per day (GPD):
- Systems ≤400 GPD: Exempt from DOH permit if properly designed and installed per all code requirements, setbacks maintained, and system is subsurface only
- Systems >400 GPD: Full DOH permit required, engineered design by PE or licensed contractor, ongoing inspection schedule
- All systems must comply with local county health department supplemental rules
- Setback distances from potable water wells must be maintained regardless of size
- Minimum 6-inch burial depth for all distribution lines under FAC 64E-6.013
- Surge tanks or distribution boxes must be watertight and rodent-proof
⚠️ Critical: DOH permit exemption does NOT mean you can skip your local building department. Many FL counties require a building permit and final inspection even for DOH-exempt systems.
What You CAN Do With Greywater in Florida
- Subsurface drip irrigation for ornamental landscaping (buried ≥6 inches)
- Watering ornamental trees, palms, and shrubs via buried lines
- Irrigation of non-edible gardens and ornamental beds
- Lawn/turf irrigation with buried distribution network
- Toilet flushing only with proper gray-to-black treatment system and DOH variance
- Constructed wetland systems (with DOH permit — typically >400 GPD tier)
Standard Setback Requirements (FAC 64E-6): 75 feet from potable water wells (50 ft in some counties); 10 feet from property lines and structures; 50 feet from streams, lakes, or surface water bodies; 6 inches minimum burial depth; 2 feet above estimated seasonal high water table. Setbacks vary by county — always verify locally.
What Is STRICTLY Forbidden Under Florida Law
- Surface spray or above-ground irrigation (any air contact with untreated greywater)
- Swimming pools, spas, hot tubs, or decorative fountains
- Any potable water use — drinking, cooking, food prep, bathing
- Irrigation of edible crops, root vegetables, or any food plants
- Cross-connection to potable water supply (federal Safe Drinking Water Act violation)
- Discharge into stormwater drains, drainage ditches, or surface water
- Allowing greywater to pond, pool, or surface anywhere on property
- Indoor use without DOH variance and approved treatment
- Car washing, pressure washing, or outdoor cleaning uses
- Children's play areas or pet areas where contact is likely
Florida County-by-County Differences
- Miami-Dade: Most restrictive — requires licensed CFC plumber AND DERM permit regardless of size/flow; 75-ft well setback strictly enforced; inspector required for final approval
- Broward County: Generally follows FAC 64E-6 with no additional overlay; systems ≤400 GPD may proceed without DOH permit with proper CFC installation
- Palm Beach County: Follows state standard; SFWMD water use permit required for systems affecting surface water allocation; 50-ft well setback adopted locally
- Orange / Hillsborough: Both require building permit and inspection even for DOH-exempt systems; local amendments may increase setbacks
- Pinellas County: SWFWMD jurisdiction adds a water use permit for systems serving more than 1 acre; reclaimed water service area restrictions may apply
- Duval (Jacksonville): JEA service area has independent inspection and backflow prevention requirements; cross-connection permit from JEA required
- Seminole County: SJRWMD oversight for consumptive use; standard state setbacks; building permit required for any plumbing modifications
- Lee / Collier: SFWMD oversees larger systems; agricultural water use crossovers create additional overlap — consult SFWMD before designing any system >200 GPD
Licensed Plumber (CFC) Always Required for Plumbing Work
Florida Statute §489.105(3)(m) defines plumbing contracting as work on pipes, fixtures, and appliances conveying water or waste:
- Any greywater system connected to your home's existing drain lines requires a Certified Plumbing Contractor (CFC) license
- Diverter valves on washing machine outlets — if connected to home plumbing — require CFC
- Surge tank installation with drain connections requires CFC
- ⚠️ "Laundry-to-landscape" systems using the washing machine's existing outlet hose into a mulched basin MAY be done without CFC in some counties — verify locally
- ❌ Unlicensed plumbing work is a 2nd-degree misdemeanor under FL §489.127
DIY Risk: Unpermitted greywater systems can void your homeowners insurance policy, trigger fines up to $5,000 from county health department, create cross-connection violations affecting neighbors, and require full removal before home sale.
Florida County Greywater Requirements
| County | DOH Permit? | Max GPD Exempt | Well Setback | Key Note |
|---|---|---|---|---|
| Miami-Dade | YES — Always | 0 GPD | 75 ft | DERM permit + CFC always; most restrictive |
| Broward | State rules | 400 GPD | 75 ft | FAC 64E-6 standard; no additional overlay |
| Palm Beach | State rules | 400 GPD | 50 ft | SFWMD oversight; 50-ft setback adopted |
| Hillsborough | Building permit | 400 GPD | 75 ft | County bldg permit + inspection required |
| Orange | Building permit | 400 GPD | 75 ft | Local amendments; OUC reclaimed water area |
| Pinellas | State rules | 400 GPD | 50 ft | SWFWMD water use permit for >1 acre |
| Duval | JEA inspection | 400 GPD | 75 ft | JEA cross-connection permit required |
| Seminole | State rules | 400 GPD | 75 ft | SJRWMD consumptive use oversight |
| Lee | State rules | 400 GPD | 50 ft | SFWMD permits for systems >400 GPD |
| Collier | Check locally | 400 GPD | 75 ft | Ag water crossover — consult SFWMD first |
Allowable vs. Prohibited Uses — Quick Reference
| ✅ ALLOWED IN FLORIDA | 🚫 PROHIBITED |
|---|---|
| Subsurface drip irrigation | Surface spray irrigation |
| Ornamental plant & tree watering | Edible food crop irrigation |
| Landscaping (6 in. buried min.) | Potable water uses |
| Ornamental shrub irrigation | Swimming pools or spas |
| Turf irrigation (buried system) | Decorative fountains |
| Toilet flushing (w/ DOH variance) | Cross-connect to potable supply |
| Constructed wetland (w/ permit) | Stormwater system discharge |
| Laundry-to-landscape (buried) | Surface water discharge |
| Mulched basin laundry discharge | Surface pooling or ponding |
Greywater System Types — Florida Comparison
| System Type | Installed Cost | Complexity | DOH Permit | Gal Saved/Day |
|---|---|---|---|---|
| Laundry-to-Landscape (washer outlet to buried mulched basin) | $200–$500 | Low | Usually No | 25–40 gpd |
| Simple Surge Tank System (covered tank + gravity-fed drip zones) | $500–$1,500 | Medium | Sometimes | 50–100 gpd |
| Constructed Wetland (gravel/plant bio-filtration; highest treatment) | $2,000–$10,000 | High | Yes (>400 GPD) | 100–300 gpd |
| Pump-Fed Drip System (pump + filter + buried drip emitters) | $1,000–$3,000 | Med–High | Sometimes | 60–150 gpd |
Federal Tax Credits Available to FL Homeowners
- IRA §25C — Heat Pump Water Heater: 30% of purchase & installation cost, up to $2,000/year nonrefundable tax credit. Must be new, ENERGY STAR certified. File IRS Form 5695. Available Jan 1 2023 – Dec 31 2032. Stackable with utility rebates.
- IRA §25D — Solar Water Heating System: 30% uncapped tax credit. FL gets ~280 sunny days/year — excellent ROI. Must be certified by SRCC or OG-300. Steps to 26% (2033), 22% (2034), then expires unless renewed.
- IRA §25C — Home Energy Audit: 30% of audit cost, up to $150. Must be conducted by a qualified auditor.
Note: Federal credits are nonrefundable — they reduce tax liability dollar-for-dollar but cannot generate a refund. Unused credit may carry forward. No direct federal rebate for greywater systems exists as of 2026, but some utilities have greywater-specific programs. Average rebates available to FL homeowners are $750+.
Payback Calculator — When Does Upgrading Pay Off?
FL blended water + sewer rate is ~$11/1,000 gal. Upgrade reference costs and savings:
| Upgrade | Installed Cost | Typical FL Rebate |
|---|---|---|
| HET Toilet (1.6 → 1.28 GPF) | $180–$450 | $100/fixture |
| WaterSense Shower Head (2.5 → 1.5 GPM) | $85–$200 | $25/fixture |
| Bathroom Faucet Aerators ×2 (2.2 → 1.0 GPM) | $35–$80 | minimal (varies) |
| Kitchen Faucet Aerator (2.2 → 1.5 GPM) | $45–$120 | minimal (varies) |
| HE Front-Load Washer (28 → 14 gal/load) | $800–$1,400 | $100 |
| Smart Irrigation Controller (weather-adaptive) | $250–$600 | $150 |
| Tankless Water Heater | $1,200–$3,500 | Federal §25C up to $2,000 |
Note: Kitchen sink is NOT greywater in FL. Laundry, shower, and bathroom-sink water count as greywater and pair well with a greywater system.