Tag Archives: compliance

Development of DBP Non-Compliance Potential Index

Islam N, Sadiq R, Rodriguez MJ, Legay C. Assessing regulatory violations of disinfection by-products in water distribution networks using a non-compliance potential index. Environmental Monitoring and Assessment. 2016 May;188(5):304. doi: 10.1007/s10661-016-5306-3.

Inactivating pathogens is essential to eradicate waterborne diseases. However, disinfection forms undesirable disinfection by-products (DBPs) in the presence of natural organic matter. Many regulations and guidelines exist to limit DBP exposure for eliminating possible health impacts such as bladder cancer, reproductive effects, and child development effects. In this paper, an index named non-compliance potential (NCP) index is proposed to evaluate regulatory violations by DBPs. The index can serve to evaluate water quality in distribution networks using the Bayesian Belief Network (BBN). BBN is a graphical model to represent contributing variables and their probabilistic relationships. Total trihalomethanes (TTHM), haloacetic acids (HAA5), and free residual chlorine (FRC) are selected as the variables to predict the NCP index. A methodology has been proposed to implement the index using either monitored data, empirical model results (e.g., multiple linear regression), and disinfectant kinetics through EPANET simulations. The index’s usefulness is demonstrated through two case studies on municipal distribution systems using both full-scale monitoring and modeled data. The proposed approach can be implemented for data-sparse conditions, making it especially useful for smaller municipal drinking watersystems.

Investor-owned water companies have a cleaner record than public utilities

From the American Water Intelligence (AWI) report (click here):

“An AWI analysis of EPA data on serious violators of the federal Safe Drinking Water Act has shown that privately owned and operated water utilities – especially large investor-owned companies – have a much cleaner record than public utilities when it comes to SDWA violations and fines.”

“The analysis, which included data on water systems with serious violations and least 500 customers over the past three years, showed that only 13 percent of facilities with current, serious SDWA violations are run exclusively by private companies. Only one of the 1,369 serious violators in the list is a large, investor-owned water company.”


Figure source: American Water Intelligence