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 120V AC powered 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.
We have the availability of 12V or 24V DC powered UV systems. These eliminate the requirement to keep the inverter on (power overhead) and the conversion loss (about 4-6%) within the inverter adding to the power consumed for the UV system.
One of the things to remember about UV systems is that they need to be on 7/24. Turning them off when you won't be using the water for a while isn't an option unless you drain the system (backwards) each time you do so. This is because bacteria may float past the unlit light even when the power to the pump is off because an open tap, toilet or even a small dripping tap will cause residual pressure within the system to pull non-sterilized water into what should be and the sterile system beyond the UV light. Even fluctuations in temperature of the water pipes can cause water to travel back and forth. Draining the system also requires you flood the UV light with water before you allow it into the building. Also most UV lights are not instant-on but need to build to full luminosity.
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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