PEX pipe showed a higher growth of coliform bacteria than copper pipe [42]. The levels of released metal from plastic pipes were monitored in five pipe systems, PB, PVC, PP, PE, and cPVC.
PEX pipe leaching and contact water toxicity was directly evaluated. Plastic pipe carbon leaching increased with elevated water temperature. Chemicals leached caused microbial growth to increase compared to glass controls.
Currently, PEX plumbing is one of the most widely used plumbing systems around the world. It was temporarily banned in California for a while due to concerns about toxic materials but this was later disproven by laboratory tests.
Is PEX safe for drinking water? Yes, our PEX-a and PEX-b are both safe for drinking water. Our piping system solutions are all third-party tested through IAPMO or NSF to the following standards: NSF/ANSI 61 drinking water systems components - health effects.
PEX has a high tensile strength and is highly durable, cost-effective, and flexible. Yet, it can still experience the concern of pipe cracks or general damage when under the influence of things like significantly intense UV rays.
The use of PEX piping can be detrimental to household water quality PEX piping is known to leach regulated gasoline components such as MTBE, ETBE, TBA and Toluene into drinking water.
The problem with PEX seems to be that it's contaminated -- it leaves the factory with chemicals used in its manufacture still on the pipe. In time it cleans up, but during that time those chemicals are going into the water.
Below is a list of the different materials water pipes are made of and what temperatures they can withstand. The answer to “Can you pour boiling water down your sink drain?” is: If your water pipes are made of Pex, CPVC or PVC – they are NOT made to withstand the temperature of hot, boiling water.
PEX Pipe Class Action Lawsuits
A number of manufacturers, including Uponor, Viega, Nibco and Zurn, have already been sued over their PEX piping products.
The lifespan of PEX pipes is one of their most appealing features. On average, PEX pipes can last anywhere from 40 to 50 years, and in some cases, even longer.
Caution: Do not use Uponor AquaPEX piping to connect the tub and shower valve to the tub downspout as this may create excessive back pressure in the valve, causing it to remain slightly open. I have always known pex to outflow copper...
Findings show some chemicals released by plumbing pipes can be transformed into carcinogenic chemicals regulated by the EPA; chemicals leached by certain plastics are conducive to bacterial growth; and plumbing system cleaning practices described in some, but not all, plumbing codes can cause PEX pipe chemical leaching ...
PEX Pipe Is Vulnerable
Rodents Chewing Through PEX Pipe is a common problem in our area. It doesn't matter how old your home is, if you have an attic, you need to watch for rodent damage to PEX Pipe or PVC. If you're hearing rustling noises coming from the attic, it's time to do an inspection.
The easiest way is to ensure thorough bleach cleaning inside the pipes to remove biofilm from the biofouling, bacteria, and other harmful microorganisms. It also reduces the build-up inside the pipes.
Common Causes of PEX Pipe Failures
In addition, extreme bends and kinks place a very high local stress on the wall of the pipe, making it more susceptible to oxidative degradation. This is especially true in southern climates where water chlorine levels run high.
Copper has been a standard plumbing pipe material since the 1960s, and with good reason. First, copper is the preferred choice from a safety standpoint because it preserves drinking water quality. Unlike galvanized steel or cast iron, copper is corrosion-resistant and doesn't leach rust or sediment into the water.
Filtering water from PEX lines makes it safe for consumption. Most homeowners stick to other pipe options for water supply lines, like copper.
Lower Lifespan Than Other Materials
While PEX plumbing is cheaper upfront, the cost benefits may be negligible when you consider that it might not last as long as copper or other materials. PEX pipes have an average lifespan of about 40-50 years, while copper can last over 70 years.
PEX pipe is more durable than rigid pipe in cold weather but is still susceptible to burst in extreme conditions.
Under normal circumstances, both copper and PEX piping should last for around 50 years. However, if your house has issues with hard water, it will often lead to the water lines only lasting half as long since they will start to become severely clogged with mineral deposits.
At what temperature will PEX freeze and burst? PEX pipes are extremely burst- and freeze-resistant because of their insulation properties and natural flexibility. However, at certain temperatures, even PEX can no longer stand up to the elements. The temperature cutoff for PEX pipes is around -7°C.
But pouring things like Liquid-Plumr, Drano, or even boiling water down your drain might do more harm than good. This is especially true if your home has cast iron pipes, which are still common in many houses. Chemical cleaners can eat away at your pipes, and boiling water can melt important components.
Fact: PEX tubing is BPA-free and does not contain other harmful chemicals that could leach into your water supply. Numerous studies, including a comprehensive Norwegian study, have shown that PEX is safe for drinking water and poses no health risks.
In most cases, PEX is extremely durable and lasts up to 50 years or more. PEX piping is also less likely to crack or break than metal pipe because it does not expand and contract as much when heated and cooled.
Based on this analysis, the PEX pipe material examined appears to have good resistance to chlorinated water. References 1. USEPA.