The 1999-2001 version of the datalayer shows all pools that were certified as of June 30, 1999.
Vernal pools are small, shallow ponds characterized by lack of fish and by periods of dryness.
Vernal pool habitat is extremely important to a variety of wildlife species including some amphibians that breed exclusively in vernal pools, and other organisms such as fairy shrimp which spend their entire life cycles confined to vernal pool habitat. Many additional wildlife species utilize vernal pools for breeding, feeding and other important functions. However, the certification of a pool only establishes that it functions biologically as a vernal pool. Certification does not determine that the pool is within a resource area protected by the Wetlands Protection Act. The Certified Vernal Pools layer is stored as a single coverage named CVP9901.