Six years after Ventura County farmers began the long process of curbing pollution that runs into local waterways, horse and cattle ranchers in the Ojai Valley on Tuesday started down a similar road to keep manure from reaching the Ventura River.

More than 50 ranchers, environmentalists and local leaders attended a meeting at Chaparral High School to learn about the regulations that will be placed on horse and cattle operations with the goal of cleaning up the Ventura River, where algal blooms caused in part by manure run-off is choking the river.

While environmentalists lauded the process as a necessary step, some ranchers said the rules were an unneeded and burdensome mandate that hurts their bottom line.

“It’s just going to cost us more money and infringe on my rights as a personal property owner,” said Mike Price, who runs a cattle ranch in Ojai.