Water-quality monitoring program system

In 1966 and 1967, when the use of endrin was not restricted, endrin was detected in 5 of 67 raw water samples from the Mississippi and Missouri Rivers (Schafer et al. 1969). At a later time when endrin use was substantially restricted, an Iowa study of 33 community water supplies using surface water found no detectable concentrations of endrin in the distribution systems (Wnuk et al. 1987). In an extensive water quality monitoring program conducted by the California Department of Health Services, endrin was detected (detection limit not specified) in only 2 of 5,109 public drinking water sources sampled from 1984 to 1992, at mean and maximum concentrations of 0.06 and 0.10 ppb, respectively (Storm 1994). Concentrations did not exceed the Maximum Concentration Level (MCL) of 0.2 ppb. In another recent study, endrin was not detected (detection limit not specified) in 32 samples each of raw water and highly treated reclaimed waste water undergoing evaluation as a possible supplement to raw water sources in San Diego, California (De Peyster et al. 1993). 

The quality of PW and WFI is constantly monitored. The FDA has provided guidance for the validation of water systems. The validation program consists of three phases. Phases 1 and 2 are for 2-4 weeks each of continuous sampling and testing of water to establish the effectiveness of the pretreatment and purification and distillation processes. Phase 3 is routine monitoring of the water quality over the remainder of a 1 year period to gauge the influences of seasonal conditions on the water quality. 

Drinking water suppliers must have a good quality assurance program to ensure that the product (drinking water) they supply to the consumer meets the relevant standards. Analysis of drinking water becomes an important step of the program. It is necessary to monitor key locations in the water supply system with the support of good analytical procedure and quality control to ensure the accuracy of the analysis. 

National Water Data Exchange NAWDEX uses Public c This system is designed to improve the transfer of data on water quantity and quality. A central index of data are available by location and by pollutant category. Water-monitoring data from federal, state, and local programs are indexed... 

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