Water Sterilization by Ultra Violet (UV) Light
Not many Off-Grid homes have the opportunity to have a drilled well installed. All other sources of water are susceptible to ground source contamination. Even if you bring drinking water with you, you may not be using it to wash your dishes, toothbrush and vegetables. Each of these can expose you to pathogens in your water. Water that was fine five minutes ago can easily be contaminated by a passing muskrat, bird or whatever that's defecated in the lake.
Depending on sizing our UV lights use as little as 20W of power. A load carried by a 80 watt solar panel on an average summer day. A point of use UV water sterilizer can use as little as 12W! ...about 0.288 kilowatt hours or in 12V speak 24 Ahr per day.
For those supplying water to others as a service e.g. Lodges, campgrounds and motels etc.
If your business or premises makes drinking water available to the public and you do not get your drinking water from a municipal drinking water system, you may be an owner or operator of a small drinking water system.
Effective December 1, 2008, the Ministry of Health and Long-Term Care (MOHLTC) have oversight of small drinking water systems (SDWS) in Ontario
As of December 1, 2008, Ontario Regulation 252/05 under the Safe Drinking Water Act, 2002 will be revoked. If you own or operate a drinking water system that is currently subject to Ontario Regulation 252/05, your system is subject to Ontario Regulation 318/08 under the Health Protection and Promotion Act as of December 1, 2008. The requirements under Ontario Regulation 318/08 are similar to those in Ontario Regulation 252/05.
Ontario Regulation 318/08 will continue to apply to your SDWS until an inspector from your local public health unit has conducted a site-specific risk assessment on your system and issued a directive to you, as described below.
Once a directive relating to your system has been issued, your system will become subject to Ontario Regulation 319/08 under the Health Protection and Promotion Act.
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Caribbean and US