you are probably correct about BPA but my point was that all plastics leach.
http://www.medicinenet.com/plastic/page2.htm
What is high-density polyethylene (HDPE)?
High-density polyethylene (HDPE) is used to make many types of bottles. HDPE has good barrier properties; it's well suited for packaging products with a short shelf life and has good chemical resistance. It is identified with the number 2. HDPE is used in milk, juice, and water bottles along with household items such as shampoo, conditioner, detergent, cleaners, motor oil, and antifreeze. It can also be found in pipe, tiles, plastic film and sheeting, buckets, crates, and recycling bins.
http://onlinelibrary.wiley.com/doi/10.1002/pen.10259/abstract
Abstract
The use of synthetic pipes for drinking water distribution has increased. High desnity polyethylene (HPDE) is preferred because of its favorable mechanical properties, ease of handling during manufacturing, and low permeability to external contaminants. Off-flavor drinking water is a problem with plastic pipes.
The compounds causing off-flavors are mainly carbonyl compounds. A combined zeolite called Abscents is used to eliminate odors and to remove odor-causing compounds. In this study, four different amounts of Abscents were added to raw HDPE pellets, and the influence on the off-flavor properties were analyzed. When the maximum amount of Abscents was added, almost all the carbonyl compounds disappeared, and the intensities of odors also decreased. The use of Abscents notably increased the acceptability of HDPE pipes.
http://http://www.laboratoryequipment.com/news-method-to-detect-dangerous-carbonyl-compounds-010611.aspx
Carbonyl compounds from motor vehicle and industrial emissions are precursors to ground-level ozone, a major component of smog, and are strongly associated with respiratory and pulmonary problems. They are also found in food and drinking water and various indoor living and working environments. Formaldehyde, a common indoor pollutant, is released from numerous sources including plywood, furniture, paper products, glues, cosmetics, tobacco smoke and many others. Formaldehyde and acetaldehyde have been classified as probable or known human carcinogens by regulatory agencies including the United States Environmental Protection Agency (EPA) and International Agency of Cancer Research (IARC).