My son has just been diagnosed with an immune deficiency, and I should be sterilizing his drinking water -which I am doing by boiling for him. I am wondering if distilled or reverse osmosis, bottled water would effectively remove bacteria from the water, and be a safe alternative. Would one be better then the other.

Thank you for your time,

Lisa

Thank you, Lisa, for your question and it pains us to learn of your son’s condition. We hope that modern medicine can find a way to help your son live a long and healthy life.

Regarding your question about the best way to sterilize water for people with compromised immune systems, the EPA and CDC co-released a document back in 1995 that gives a lot of useful information on the topic entitled Guidance for People with Severely Weakened Immune Systems.

Below you will find excerpts from that document relating directly to the questions you asked:

• Cryptosporidium has caused several large waterborne disease outbreaks of gastrointestinal illness, with symptoms that include diarrhea, nausea, and/or stomach cramps. People with severely weakened immune systems (that is, severely immunocompromised) are likely to have more severe and more persistent symptoms than healthy individuals. Moreover, Cryptosporidium has been a contributing cause of death in some immunocompromised people.
• Although data are not sufficient for EPA/CDC to recommend that all severely immunocompromised persons take extra caution with regards to their drinking water, individuals who wish to take extra measures to avoid waterborne Cryptosporidiosis can bring their drinking water to a full boil for one minute. Boiling water is the most effective way of killing Cryptosporidium.
• Only point-of-use filters that remove particles one micrometer or less in diameter should be considered. Filters in this category that provide the greatest assurance of Cryptosporidium removal include those that use reverse osmosis, those labeled as “Absolute” one micrometer filters, or those labeled as certified by NSF International under standard 53 for “Cyst Removal.” …. Water treated with a point-of-use filter that meets the above criteria may not necessarily be free of organisms smaller than Cryptosporidium that could pose a health hazard for severely immunocompromised individuals.
• Many, but not all, brands of bottled water may provide a reasonable alternative to boiling tap water. …. Any bottled water treated by distillation or reverse osmosis before bottling assures Cryptosporidium removal.

• Neither EPA nor CDC maintains a list of point-of-use filters or bottled water brands that meet the above criteria. NSF International can provide a list of filters that meet the NSF criteria.

We suggest you take a look at the NSF Web Site to see what systems meet their requirements. In a situation like yours, you will want to make certain the product you purchase will accomplish all your objectives — and then some.

One system we came across recently, the Pentek RO-3500 Monitored Reverse Osmosis System,

NSF Tested & Certified Standard 58 for reduction of TDS, Fluoride, Turbidity, Lead, Nitrates, Selenium, Arsenic, Copper, Cadmium, Barium, Cyst, and Radium.

The Pentek R0-3500 features the 3 stage system, one ROM-230TN membrane, a D15 sediment filter, a D20 carbon filter, and one long-reach lead-free faucet. Unit comes with a standard installation kit and instructions.

Another feature of the the Pentek RO3500 which makes it quite nice… an electronic monitoring system that keeps track of the water filters cartridges’ lifespans and informs the owner when they need replacing.

What elements does the RO-3500 Reverse Osmosis System reduce and/or eliminate? The unit has the ability to filter out the following elements as well as many other chemical compounds:

• 90.2% TDS ( test for TDS )
• 98.9% Arsenic ( test for arsenic )
• 90.5% Fluoride
• 98% Phosphates
• 99.99% Cysts
• 99.7% Turbidity
• 98.7% Lead ( test for lead )
• 87.4% Nitrate ( test for nitrates )
• 80.7% Nitrite ( test for nitrites )
• 97.5% Selenium
• 99.9% Copper ( test for copper )
• 97.3% Cadmium
• 86.6% Hexavalent Chromium ( test for chromium )
• 92.8% Trivalent Chromium
• 80% Radium 226/228
• 90.7% Barium
• Chlorine ( test for chlorine )
• Sediment & Particulates

For more information on the Pentek Reverse Osmosis System mentioned above, please read its detailed specifications on FiltersFast.Com.

One final word

Use of a reverse osmosis systems does NOT guarantee the elimination of ALL possible biological contaminants since some biological contaminants have sizes smaller than the membranes in RO units can filter out.

For that reason you may want to consider adding a UV Sterilizer to your filtration setup. These devices render biological contaminants incapable of reproducing by altering their genetic structure with specific wavelengths of light.

• Cryptosporidium, a gastrointestinal parasite, contaminated the municipal drinking water of Milwaukee, Wisconsin in 1993 and caused one hundred deaths. ( source )

• A deadly strain of e.coli bacteria found its way into the municipal water supply of Walkerton, Canada in 2000 causing hundreds of residents ill and eventually taking the lives of seven people. ( source )

It sounds shocking that such horrible water quality tragedies could happen in modern times given the frequency of municipal water testing, but two very important facts stand out if you take the time to think about the way in which municipal water systems operate:

1. Municipal water systems test for a set number of water quality parameters and sometimes rare, unusual, and often not-tested-for water vermin like Cryptosporidium can easily slip past even the most stringent water testing programs. Example: Milwaukee, WI in 1993.

2. Municipal water systems test water at the point of distribution, not use. This means the water leaves water treatment facilities fully tested and approved for consumption… but keep in mind that the water must travel through many miles of piping and plumbing with literally thousands of joints and welds where harmful contaminants could find their way into the water if only one of those places has cracked or otherwise become deficient.

So as you can see, even the best water treatment plants in the world with the best records for drinking water quality cannot issue a 100% guarantee that your tap water will contain no unwanted contaminants. Once water leaves their grounds its quality can change for innumerable reasons and in innumerable ways… so ultimate responsibility for making sure you have safe, clean tap water falls on… your shoulders.

Installing the correct point-of-use water filtration and/or purification system (i.e. countertop, undersink, whole house, shower, etc.) can negate pretty much all the possible risks associated with water contamination between the distribution point and your favorite glass.

Take the time to learn about the different point-of-use water treatment options you have available and, of course, don’t forget to test your drinking water periodically, even after installing a filtration/purification system, to make sure it continues to function properly!

• Symptoms shown by a person afflicted by Giardia include, but may not be limited to, diarrhea, fatigue, and cramps.
• Symptoms shown by a person afflicted by Cryptosporidium include, but may not be limited to, diarrhea, nausea and stomach cramps. Additionally, this type of bacteria resists many common disinfection methods quite well.

note: Individuals with suppressed or compromised immune systems may exhibit worse symptoms for longer periods of time than peole with ‘healthy’ or ‘normal’ immune systems.

The best way to guarantee the safety of your water after a flood means getting the water tested by certified water professionals. Home water test kits for bacteria serve as excellent maintenance tools for checking the bacteria levels of well water, but in the event of an actual ‘incident’ such as a flood, which may have caused the contamination of your drinking water, always seek the advice and assistance of Water Quality Experts in your area.

Locating Certified Drinking Water Laboratories

The United States Environmental Protection Agency suggests you contact the State Certification Officer for Drinking Water Laboratories for your state.

Click here to access a list of contact phone numbers, email addresses and physical addresses for State Certification Officer for Drinking Water Laboratories on the United States Environmental Protection Agency web site.