Key Biscayne water and sewer rates
Who supplies water to Key Biscayne houses, what it costs, and how the sewer charge works.
Miami-Dade Water and Sewer Department (WASD)
Miami-Dade Water and Sewer Department residential water rates, 2026-27, effective Oct. 1, 2026: $5.36 a month for a 5/8" meter, which includes 2,244 gallons (3 ccf), then $4.3455 per ccf from 4 to 17 ccf and $10.5112 per ccf for 18 ccf and over (one ccf equals 748 gallons). The Florida Department of Revenue lists a 10% Key Biscayne public service tax on water.
| Use a month | Price per unit (CCF, 748 gallons) |
|---|---|
| Fixed charge | $5.90 a month |
| 0 to 3 units | $0.00 |
| 3 to 17 units | $4.78 |
| 17 to more | $11.56 |
- PFAS
- 2025 Main System results: PFOS 33 ppt (range 7-33) and PFOA 13 ppt (range 3-13); the federal MCL column shows 4 ppt for each.
- Fluoride
- The Alexander Orr, Jr., John E. Preston and Hialeah plants stopped adding fluoride on June 6, 2025.
Sewer
Miami-Dade Water and Sewer Department residential wastewater rates, 2026-27, effective Oct. 1, 2026: a $9.13 monthly base facility charge for a 5/8" meter, which includes 2,244 gallons (3 ccf), plus $8.6573 per ccf for 4 ccf and over.
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Sources
Checked October 22, 2026. Every number here comes from the public sources listed, matched by our checker.
Rates change every year; this page shows when it was last checked. Nothing here is legal, tax or insurance advice.