Full Description

The National Primary Drinking Water Regulations for lead and copper requires public water systems (PWSs) to collect lead and copper samples at a specified number of consumer's taps. If more than 10% of the system's samples are above the action level for either lead or copper, the system must monitor water quality characteristics and pursue corrosion control treatment. The Environmental Protection Agency Region 8 is the primary agency for the State of Wyoming and its approximately 738 public water systems. In the Fall of 1998, the USEPA Region 8 contracted with Cadmus and Economic and Engineering Services, Inc. to assist in the preparation of optimal corrosion control recommendations for approximately 40 Wyoming public water systems. As the ten-year anniversary of the Lead and Copper Rule (LCR) approaches, public water systems with copper action level exceedances and high dissolved organic carbon are still struggling to solve their corrosion control problems. The LCR regulation specifies that the control of lead and copper in drinking water is to be accomplished through the installation and operation of optimal treatment. In states such as Wyoming and Utah, many of the copper action level exceedances occur in small and medium systems with high DOC and high hardness groundwater supplies. A thorough review of passivation and precipitation corrosion control technologies indicates that there are currently no methods of treating these waters in an affordable manner, with the potential exception of ortho- or blended phosphate addition. Unfortunately, there currently is little information associated with required blended phosphate dosages and the likelihood of success with this approach.

Product Details

Published: 01/01/1999 ISBN(s): 1583210016 Number of Pages: 16File Size: 1 file , 200 KB