Drinking tap water is a simple act that often goes unnoticed, but when it comes to Philadelphia, there's more to the story than meets the eye. As an expert in drinking water infrastructure and policy, I find the topic of Philly's tap water fascinating and worth exploring in detail. This article will delve into the quality of Philly's tap water, the regulations that govern it, and the implications for residents.
Understanding Philly's Tap Water
The Philadelphia Water Department's annual report provides an insightful look at the city's drinking water quality. It's a valuable resource, but it's essential to understand the context and limitations of such reports. The report reveals that Philly's tap water meets federal standards for approximately 100 regulated contaminants. However, this number pales in comparison to the thousands of chemicals and disinfection byproducts that exist and could potentially find their way into our water supply.
The Regulatory Landscape
Drinking water in the U.S. is regulated under the Safe Drinking Water Act, which sets limits for a relatively small number of contaminants. The process is reactive, meaning the EPA must demonstrate a contaminant's potential harm before setting a limit. This approach can be slow and may not always protect public health proactively.
For instance, the EPA recently set individual limits for six PFAS compounds and regulated four as a mixture. However, proposed changes include rescinding the mixture provision, which could have significant implications for water quality.
Goals vs. Limits
Federal drinking water standards consist of two numbers: the maximum contaminant level goal (MCLG) and the maximum contaminant level (MCL). MCLGs are set at concentrations believed to pose no significant health risk, but they are non-enforceable. MCLs, on the other hand, are enforceable but often higher than MCLGs due to considerations of cost and feasibility.
Forever Chemicals and Lead
Two forever chemicals, PFOA and PFOS, have been detected in Philly's tap water, exceeding the new federal limit of 4 parts per trillion (ppt). However, Philly remains in compliance due to the extended deadline for meeting the federal limit. The levels are also below Pennsylvania's limits.
Lead in drinking water is a serious concern, especially in older homes with lead service lines or plumbing. The Philadelphia Water Department's treatment includes corrosion control to reduce lead leaching, but testing results show that some homes with lead service lines still have measurable lead in their water.
Disinfectants and Sodium
Chemical disinfection is essential for keeping Philly's water safe, but it produces byproducts linked to increased cancer risk. The Philadelphia Water Department's annual averages for these byproducts were well under federal limits, but individual samples exceeded them, suggesting potential issues for homes further out in the distribution system.
Sodium levels in Philly's tap water are a concern for those on sodium-restricted diets. Depending on which plant serves you, sodium intake from tap water can range from 30 to 350 milligrams per day, which could be significant for those with health conditions like hypertension or kidney disease.
Taking Action
Reducing household exposure to drinking water contaminants is possible with the right tools. Carbon filters certified to NSF/ANSI Standard 53 can effectively reduce disinfection byproducts, PFOA, PFOS, and lead. For sodium, an ion-exchange pitcher or a reverse osmosis system is recommended.
Additionally, if your home has a lead service line or older plumbing, running cold water from the tap for a few minutes before drinking or cooking can help flush out water that has been in contact with plumbing.
Conclusion
Philly's tap water quality is a complex issue, and while it generally meets federal standards, there are areas of concern. As an expert, I believe it's crucial to stay informed about the regulations and take proactive measures to ensure the safety of our drinking water. The Philadelphia Water Department's efforts to expand PFAS removal and provide resources for lead testing are encouraging steps in the right direction.
