tems-38, 35, and 34 percent, respe tively. Sanitary surveys, which are es phasized by the SWTR, were used by percent of the watersheds and we ranked sixth in overall effectiveness. U formal written agreements with lan owners in the watershed, similarly re ded by the SWTR, were found Ommen only 16 percent of the watersheds ar were one of the three least common co trol measures. formal agreements wi landowners were ranked as the least ective control measure by water utilitie Water quality monitoring program The survey gathered information on th monitoring frequency o key water qua variables. Figure 3 displays theresu the monitoring program inventory terms of the percenta of systems tha monitor foragiven water quality variab any frequency,The block charts corr spond to the four general categories monitoring locations that were invent ried for the survey: finished water, ra water intake, reservoirs, and tributa streams. (A 100 percent scale is shown interpretation of the frequency ribution The bar heights (and co responding percentages) for the rows beled reservoirs and ributa streams" have been adjusted to accou only those systems that have the portunity to monitor in these locatio Gue., the few systems that obtain wate from intakes on large rivers were elim nated from the analysis The analysis found that monitoring some frequency (e.g.. daily, week monthly) for a given water quality val able occurs in about the same relativ proportion for the four monitoring loc tion categories. The basic physical wat quality variables (turbidity, temperatur and ph) are the most commonly ored variables in all locations. The survey also highlighted a numbe of s in raw water monitorin on a nationwide scale. For programs ample, only 60 percent of the system monitor reservoirs for key, easily me sured variables such as turbidity and pl and even fewer (about one third of th systems monitorthese variables in the tributary streams. Monitoring for two the basic indicators of eutrophication- JOURNAL AWW