An on-again, off-again effort by state regulators to better protect the Russian River and its tributaries against failing septic systems, livestock waste and other potential sources of bacterial contamination is in its final stages, with hopes that an action plan for the entire watershed will be approved this August and go into effect next year. The move, controversial and closely watched in years past, could impose stricter regulations and mandatory septic system upgrades on thousands of landowners with properties near the river or its connected waterways.