[12] As chairman of the Resources and Land Use Committee in the California State Assembly, Z'berg created legislation to fund anti-litter campaigns, to ban pull-tab drink cans, and to increase the rate of clean-up along roads and shorelines.

He used his position on the Natural Resources committee to defeat plans for a freeway along the west side of the lake[15] and a bridge over Emerald Bay.

[16] In 1966, in support of bill AB11 to protect Lake Tahoe's south shore from sewage pollution, Z'berg said, "we shouldn't delude ourselves into thinking this will have a long-range effect.

[17] The following year, he introduced a bill to create a bistate agency with both California and Nevada board members to regulate pollution and overdevelopment in the entire Lake Tahoe area.

[20] The California portion of Z'berg's Tahoe Regional Planning Agency was signed into law by governor Ronald Reagan on November 8, 1967.

[26] Z'berg co-authored the Chappie-Z'berg Off-Highway Motor Vehicle Law with Republican assemblyman Eugene A. Chappie to protect and preserve public lands.

He negotiated with a competing bill in the state senate and with Governor Ronald Reagan's administration before the combined Z'berg-Nejeldy Forest Practices Act was signed into law in 1973.

Because reapportionment had decreased the number of registered Democrats in the district by 10%, his Republican Party opponent made a strong push to defeat Z'berg.

Shortly thereafter, legislators passed a resolution naming a portion of Lake Tahoe's Sugar Pine Point State Park as the Z'berg Natural Preserve.

[38][5] Z'berg was a member of the Veterans of Foreign Wars, Sacramento Swiss Lodge, the Fraternal Order of Eagles and the Aircraft Owners and Pilots Association.