If you currently have toilets with 3.5 gallons per flush (gpf) or more and you replace it with an EPA WaterSense Labeled High Efficiency Toilet (HET), which uses 1.3 gallons per flush or less you can receive a rebate. The following link takes you directly to the HET rebate application: http://bawsca.org/docs/HET_Application_FY_12-13.pdf
If you replaced your toilet that was 3.5 gpf to 1.6 gpf in the last 5 years you will not be asked at this time to switch to the 1.28 gfp until your re-certification in 3 years. There are no rebates available for replacing 1.6 gpf with a 1.28 gpf.
If you have further questions, please contact your Green Business Program coordinator.