EPA has set the arsenic standard for drinking water at 0.010 parts per million (or 10 parts per billion) to protect consumers served by public water systems from the effects of long-term, chronic exposure to arsenic.  Water systems  must comply with this standard by January 23, 2006, providing additional protection to an estimated 13 million Americans. 

For more information on arsenic, click on the link 'Arsenic Basic Information' or 'Arsenic Rule'.

The purpose of the LT2 rule is to reduce illness linked with the contaminant Cryptosporidium and other disease-causing microorganisms in drinking water.  The rule will supplement existing regulations by targeting additional Cryptosporidium treatment requirements to higher risk systems.  This rule also contains provisions to reduce risks from uncovered finished water reservoirs and to ensure that systems maintain microbial protection when they take steps to decrease the formation of disinfection byproducts that result from chemical water treatment.

For more information on LT2, click on the link 'LT2 Basic Information' or 'LT2 Rule'.

Stage 2 Disinfectants and Disinfection Byproduct Rule (Stage 2 DBP rule)

The Stage 2 DBP rule builds upon earlier rules that addressed disinfection byproducts to improve your drinking water quality and provide additional public health protection from disinfection byproducts. This final rule strengthens public health protection for customers by tightening compliance monitoring requirements for two groups of DBPs, trihalomethanes (TTHM) and haloacetic acids (HAA5). The rule targets systems with the greatest risk and will reduce potential health risks related to DBP exposure and provide more equitable public health protection.

For more information on Stage 2, click on the link 'Stage 2 Basic Information' or 'Stage 2 DBP Rule'.