The federal government issued its long-awaited "Waters of the United States," or WOTUS, definition yesterday, extending federal authority to California's vernal pools and other naturally forming pockets of water. However, the new rule does not regulate groundwater nor many subsurface flows and states it will maintain existing provisions for stormwater systems and some ditches.
However, business and Congressional opposition to the rule remains fierce. The Association of California Water Agencies expressed disappointment with the rule, saying "ACWA remains concerned that the final rule is too broad and our requests that water conveyance systems and water infrastructure adjacent to 'navigable waters' be excluded from the proposed rule was not met."
Developers and local officials as well as agricultural and industrial businesses had sought to limit the "Waters of the United States" definition for fear it might impose Clean Water Act permitting processes on construction and water management proposals that had hitherto required only local approvals. The rule does make concessions to concerns from business, real estate and rural local governments that existing drainage systems and permit exemptions might be disrupted. California voices were very much included in this pattern, and many California local governments expressed anxiety about their stormwater discharge permits.