Low-flow toilets cause a stink in SF (February 28, 2015)
San Francisco’s big push for low-flow toilets has turned into a multimillion-dollar plumbing stink.
Skimping on toilet water has resulted in more sludge backing up inside the sewer pipes, said Tyrone Jue, spokesman for the city Public Utilities Commission. That has created a rotten-egg stench near AT&T Park and elsewhere, especially during the dry summer months.
The city has already spent $100 million over the past five years to upgrade its sewer system and sewage plants, in part to combat the odor problem.
Now officials are stocking up on a $14 million, three-year supply of highly concentrated sodium hypochlorite — better known as bleach — to act as an odor eater and to disinfect the city’s treated water before it’s dumped into the bay. It will also be used to sanitize drinking water.
That translates into 8.5 million pounds of bleach either being poured down city drains or into the drinking water supply every year.
Not everybody thinks it’s a good idea.
A Don’t Bleach Our Bay alert has just gone out from eco-blogger Adam Lowry who argues the city would be much better off using a disinfectant like hydrogen peroxide — or better yet, a solution that would naturally break down the bacteria.
As for whether the supposedly environmentally friendly, low-flow toilets are worth the trouble? Well, according to Jue, they have helped trim San Francisco’s annual water consumption by about 20 million gallons.
Source: Matier & Ross, SF Gate
Files related to sewer and wastewater treatment
- 201008 VVWRA Sewer Master Plan
- 20110228 Low-flow toilets cause a stink in SF
- 20150629 California drought taking serious toll on aging sewer system in San Francisco
- 20150831 VVWRA percolation ponds
- 20150901 Unintended consequences of conserving water: leaky pipes, less revenue, bad odors
- 20160120 Grants received by VVWRA save Victor Valley millions
See also files related to retail water rights.