Inland Empire Utilities Agency (IEUA) operates four publicly owned treatment works in the western end of San Bernardino County in Southern California. In 1995 and 1996, IEUA experienced toxicity at its Regional Water Recycling Plant No. 2 (RP-2). In 1996, using Ceriodaphnia dubia
as the test organism, twenty-four of the acute or chronic survival toxicity tests performed (approximately one-half) showed toxicity. All of the observed 1995 and 1996 toxic events occurred between April and November. In late September 1996, as a result of these events, the California State
Regional Water Quality Control Board issued a notice of violation (NOV) to IEUA. The NOV required IEUA to conduct weekly whole effluent toxicity monitoring of the effluent and extensive sampling of the trunklines for heavy metals and pesticides.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.