State lawmakers are considering a tax to help poor rural communities provide safe drinking water. Agricultural and environmental groups are backing the bill—but water companies, not so much. More than a million Californians lack safe drinking water, either due to fertilizer runoff from farms or contaminants like arsenic. The proposal would raise your water bill by around $10 a year. It could be more than $1,000 a year for farmers, says Tim Johnson, CEO of the California Rice Commission, which backs the proposal.