According to the Sac Bee, the Central Valley Regional Water Quality Control Board draft permit requires both microfiltration and the nutrient reduction program.
We knew this was possible, but we did not analyze this scenario in our earlier report since we wanted to stay focused on the ammonia issue and did not want to be accused of exagerrating. We will update that analysis to fit this draft permit in the next few weeks. The costs of the microfiltration process are actually higher than the nutrient reduction process, so the total impact will be nearly 3 times what we estimated in our earlier report.
The Bee quotes the SRCSD saying monthly residential rates could go from $20 per month to $62. Our more conservative estimate would be about $50 per month, but SRCSD is planning on a lot of reserves being required and for this to keep growth very low (thus keeping impact fee revenues way down). They may be right, I've never tried to sell $2 billion in bonds. That's a lot of debt, especially for an agency whose current revenues are only about $150 million per year.