House Bill 664, introduced in the Montana Legislature on February 22, 2025, aims to enhance water quality standards and address pollution control measures across the state. The bill outlines definitions and parameters related to water quality, including various metal contaminants and waste types that may affect state waters.

One of the key provisions of HB 664 is the establishment of a "nutrient work group," which will consist of representatives from both public and private sectors involved in pollution management. This group is tasked with advising the Department of Environmental Quality on nutrient standards and their implementation, as well as assessing the economic impacts of these standards.

The bill also defines critical terms such as "mixing zone," which refers to areas where water quality standards may be exceeded under specific conditions, and "outstanding resource waters," which are designated waters within national parks or wilderness areas. These definitions are crucial for ensuring clarity in the enforcement of water quality regulations.

Debates surrounding HB 664 have focused on the balance between environmental protection and economic interests, particularly from industries that may be affected by stricter pollution controls. Some stakeholders argue that the bill could impose significant costs on businesses, while proponents emphasize the necessity of safeguarding Montana's natural resources for future generations.

The implications of this legislation are significant, as it seeks to strengthen Montana's environmental regulations amid growing concerns about water pollution and its effects on public health and ecosystems. Experts suggest that if passed, HB 664 could lead to improved water quality across the state, but it may also spark further discussions on the economic ramifications for industries reliant on water resources.

As the legislative process continues, stakeholders will be closely monitoring amendments and discussions surrounding the bill, which could shape its final form and impact on Montana's environmental policy.