Regional San has developed a diversified biosolids management
program that is both environmentally friendly and of high value
to ratepayers. This two-pronged program consists of safely
Recycling biosolids into environmentally beneficial products
Applying biosolids to land disposal units
Each year, Regional San’s treatment plant processes
about 26,000 dry tons of biosolids, making the program one of the
largest producers of biosolids in California. Approximately 70
percent of those biosolids are treated and then injected into
on-site land disposal units, while the remainder is beneficially
recycled at our Biosolids Recycling Facility (a partnership
Biosolids are rich in nitrogen and contain phosphorus, potassium
and micro-nutrients, all necessary to the growth process. As a
fertilizer, biosolids retain soil moisture, helping to reduce
soil erosion. As a soil enhancer, biosolids can be marketed as
As dry, pelletized, odorless fertilizer
As green waste compost in which the biosolids are mixed with
natural plant materials
As the garden-variety compost
Regional San’s Biosolids Management Program includes
conducting outreach to educate the public, farmers and
community leaders about the significant benefits of biosolids
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