Overall, residential/municipal producers of waste water do not need to have a water quality report. Such waste water goes to sewerage treatment plant and is treated for disposal to groundwater, surface water bodies of the State, ocean, etc. All discharges, i.e., Sewerage treatment plants, need to have discharge permit and therefore they all need to provide water quality data for any water that they are discharging to surface water bodies, groundwater recharge, or into ocean.
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I want to focus on issues related to use of recycled water after the water is leaving the sewer treatment plant. such water is an aggregate of large amounts of water flowing from residential/municipal water users. Unless, there is an arrangement for in-situ use of recycled water that makes it necessary to have in-situ sewerage treatment plant, the data for water and water quality will be an aggregate data.
The State Water Resources Control Board, in collaboration with the Department of Water Resources, is releasing the final 2009 Municipal Wastewater Recycling Survey results (Table 1). The table updates the initial version of the results, released in the spring of 2011. The final version includes corrections to the data.
The recycling of municipal wastewater has become an integral part of California�??s water supply. The survey was conducted to assess how much wastewater is being recycled in the state. The survey identified over 669,000 acre-feet1 of recycled municipal wastewater, an increase of approximately 144,000 acre-feet since 2001 (Figure 1). The 2009 survey categorized municipal wastewater recycling into to the following beneficial uses:
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Golf Course Irrigation
Landscape Irrigation
Agricultural Irrigation
Geothermal Energy Production
Seawater Intrusion Barrier
Groundwater Recharge
Recreational Impoundment
Natural Systems/Restoration
pie chart showing municipal waste water categories
Agencies were also asked about surface water augmentation (the addition of recycled municipal wastewater to surface water reservoirs) and direct potable reuse (direct addition of recycled municipal wastewater to potable water supply lines), but neither use is currently occurring in California. However, surface water augmentation is being planned and piloted, so it may be an active beneficial use when the next survey is conducted.
The statewide totals for each of these beneficial uses in the 2009 survey are shown in the pie chart in Figure 2. Beneficial uses by region are summarized in Figure 3 and Table 2.