Which of the seven major water-treatment systems is the best?

Five major water treatment systems are rated as the best in the U.S. based on their performance, according to a new study by Water Resources Defense Council.

The study, commissioned by the U-S Water Board, found the six systems with the highest rankings in performance were all installed in California.

Water-treatment system is defined as any water system used to treat water that enters the plant or is piped to the plants.

The systems rated highest include: -California Water System-1,300,000 gallons per day-1.3 million gallons per year-2.2 million gallons daily-5 million gallons a day-8 million gallons of treatment per daySource: Water Resources Defend-1: Top 10 U.s.

Water Treatment Systems, 2015.

(Source: U-swaterboard.org)Each of the six system with the lowest scores in performance was built in the 1970s.

The only system with a higher score was installed in the 1980s, according the study.

It’s the third year the Water Resources Development Council (WRDC) has published its annual ranking of water treatment system performance.

The rankings were released this week to mark the fifth year that WRDC conducts its rankings.

WRDC’s rankings take into account a number of factors, including the overall quality of the water system, the environmental impact, and how well it meets the goals and objectives of the U S Water Supply Improvement Act (USWIA) and the Environmental Protection Agency (EPA).

The WRDC’s water-supply ranking is based on a variety of factors such as: water quality, its performance during times of drought, its ability to meet the needs of farmers and ranchers, its capacity to meet emergency drinking water requirements and how efficiently it delivers water to consumers.

In its 2017 report, WRDC found the California Aqueduct system was the nation’s most efficient water-system, according on water quality metrics.

The water-quality ranking includes the amount of water in the aqueduct’s systems, how much water is produced, and the amount the water is used for treatment.

This year, WRC released its 2017 rankings, which include all of the systems that received the highest water-sustainability ratings from the Water Resource Defense Council, the US Water Supply Initiative (USSWI), and the Water Quality Alliance (WTA).

The 2017 rankings also include a water quality score based on how the system meets the water-conservation goals of the EPA.

The scores are based on the performance of the system during drought periods, how it treats wastewater and treated sewage, and on how efficiently the system delivers water.