Overall, the number of WDR inspections declined in FY 2014-15 relative to prior fiscal years. Since Fiscal Year (FY) 2000-01, the data show a downward trend in the number of inspections of WDR facilities performed annually, although the number of annual inspections has improved slightly over the last couple years. The number of inspections performed annually does vary by region, as can be seen in the regional graph. For compliance purposes, some facilities are inspected more than once a year, so the total number of inspections performed may be 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.