A monthly bill of $57.79 for the typical residential water user would increase to an average rate of $72.90 at the end of the five years, according to an example in a staff report.
Residential water customers who use less water could see smaller hikes, while heavier water users could see bigger increases. Residential water users could see annual monthly rate hikes of between $1 and $11.
Commercial water users would see monthly bills go up between $3 and $60 annually.
The rate increases have been billed as a way to raise money to replace or fix DWP's aging system of water pipes.
Mayor Eric Garcetti backed the plan this week, saying that while "no one likes to raise rates," the "price of inaction will be much higher for all of L.A.'s residents."
Garcetti said the average increase for the typical water user would be minimal over five years and keep the DWP's rates among "the lowest in the region."
He also pointed to provisions that would create a measuring stick for whether the rate increases result in the promised improvements, with a formal review in two years to see if changes need to be made.
Garcetti's backing of the plan came a few days after the Office of Public Accountability, headed by ratepayer advocate Fred Pickel, issued a report expressing the opinion that the LADWP's water rate proposal is "just
The report noted that most of the revenue will go into capital projects, while some of the revenue will also go toward higher operating costs and the unfunded employee pension liability.
The report also found that while the purpose of the rate increase is to help upgrade aging pipelines, "the pace is too slow for the desired long-run replacement cycle."
The report also raised a concern that "staffing levels will be inadequate for the growing levels of planned capital project expenditures, in part due to the anticipated personnel retirements and constraints on outsourcing."
The average or low water user is likely to see bills grow 4 percent each year, while heavy water users could see bills go up by 7 percent per year, with the biggest increase in the first of the five-year plan, the report said
Rates could be higher than anticipated if current drought conditions continues, the report says. A typical single-family home could see a bill of $62.89 per month go up to $68.73 in one year, then to $70 per month after three years. In the final year, the bill could go to $74, according to the OPA's report.