What it means
Biomat is a gel-like layer of microorganisms and fine solids that builds at the bottom of trenches or chambers where effluent meets soil. A healthy biomat slows infiltration enough to treat pathogens and organics.
If too many solids reach the field, the biomat thickens and the soil stops accepting water. That leads to surfacing effluent, odors, and system failure.
Why it matters in Santa Cruz County
Sandy soils near Capitola and Seacliff can accept effluent quickly, while clayey Santa Cruz Mountain soils form a stronger biomat that fails faster when overloaded or fed excess solids.
Homeowner tip
Protect the biomat by pumping on schedule and keeping solids out of the drain field with a clean effluent filter.
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Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.