Alternate On-site Sources of Water Sources Water Quality (BOD) (TDS) Hardness Sediment Pathogens Organic Comments Rainwater 1-2 1 1 1 1 None Storm water 3 ? 1 2 2 May contain pesticides and fertilizers Air conditioner condensate 1 1 1 1 2 May contain copper Pool filter backwash 3 2 2 1 2 May contain treatment chemicals Cooling tower blowdown 2 3+ 3 2 2 May contain treatment chemicals RO & NF reject water 1 3+ 3 1 1 High salt content Untreated Gray water For subsurface application May contain detergents only. May need lint and bleach screening. On-site wastewater treatment 3 2 2 3+ 3+ May contain human waste Foundation Drain Water 1 ? ? 2 2 May contain pesticides and fertilizers Other Sources ? ? ? ? ? Depends on source Low level of concern Medium level and may need additional treatment depending on end use High concentrations are possible and additional treatment likely ? Dependent on local conditions When deciding on the type of treatment for an alternate source of water, remember that it is necessary only to treat to the level needed for that application. Table 15 summarizes treatment methods that may be employed for various end uses of these sources. Table 15. Types of Treatment for Alternate Sources of Water Source Filtration Biological Softening Treatment Disinfection Sedimentation Comments Rainwater (non-potable) ? ? Depends on end use
Alternate On-site Sources of Water Sources Water Quality Sediment (TDS) Hardness Organic (BOD) Pathogens Comments Rainwater 1-2 1 1 1 1 None Storm water 3 ? 1 2 2 May contain pesticides and fertilizers Air conditioner condensate 1 1 1 1 2 May contain copper Pool filter backwash 3 2 2 1 2 May contain treatment chemicals Cooling tower blowdown 2 3+ 3 2 2 May contain treatment chemicals RO & NF reject water 1 3+ 3 1 1 High salt content Untreated Gray water For subsurface application only. May need lint screening. May contain detergents and bleach On-site wastewater treatment 3 2 2 3+ 3+ May contain human waste Foundation Drain Water 1 ? ? 2 2 May contain pesticides and fertilizers Other Sources ? ? ? ? ? Depends on source Low level of concern Medium level and may need additional treatment depending on end use High concentrations are possible and additional treatment likely ? Dependent on local conditions When deciding on the type of treatment for an alternate source of water, remember that it is necessary only to treat to the level needed for that application. Table 15 summarizes treatment methods that may be employed for various end uses of these sources. Table 15. Types of Treatment for Alternate Sources of Water Source Filtration Sedimentation Disinfection Biological Treatment Softening Comments Rainwater (non-potable) ? ? Depends on end use