In FY 14/15, 8 percent of industrial facilities regulated under individual WDRs were inspected statewide. In Fiscal Year (FY) 2014-15, 8 percent of industrial WDR facilities were inspected statewide. Although the percentage of facilities inspected varies among the Regional Water Boards, approximately 47 percent of all inspections occurred in the Central Valley Region (Region 5). For compliance purposes, some facilities are inspected more than once a year, which is why the total number of inspections is greater than the total number of facilities inspected. It is the Water Boards' policy to ensure that facilities comply with Water Quality Control Plans, National Pollutant Discharge Elimination System (NPDES) permits, and waste discharge requirements (WDR). This policy is implemented through the Regional Water Board comprehensive self-monitoring and compliance inspection programs. Inspections are a primary tool used in determining and documenting compliance with WDRs. Inspection frequencies for WDR facilities are based on threats to water quality, with high risk sites and registered complaints receiving more attention. In addition to inspections, the Regional Water Boards assess facility compliance by reviewing self-monitoring reports submitted by the discharger and responding to complaints. The conditions described by self-monitoring data are validated through periodic inspections, which are the Water Boards' only means to evaluate system maintenance and observe unreported activities.