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WaterOperator.org Blog

Arsenic in Drinking Water

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Arsenic is a heavy metal and a regulated contaminant in drinking water and wastewater effluent. In 2001, under the Arsenic Rule, EPA adopted a lower standard for arsenic in drinking water of 10 parts per billion (ppb) which replaced the previous maximum contaminant level (MCL) of 50 ppb. Arsenic is a semi-metal element in the periodic table. It is odorless and tasteless. It can enter drinking water supplies from natural deposits in the earth or from agricultural and industrial practices. 

We have 180 resources (and counting) on Arsenic in our Documents Database that provide valuable information on this topic. You can search for documents about the arsenic rule, complying with the arsenic maximum contaminant level, the reporting requirements for the annual Consumer Confidence Reports (CCR), and many other useful guides that will help you to deliver safe and clean water to utility customers. 

To access the wealth of Arsenic related knowledge within our database just select "CATEGORY" in the dropdown then choose "Arsenic." Once you make that selection, a second dropdown will appear where you can choose "HOST," “TYPE,” or “STATE” to narrow the search even further. If you have a specific search term in mind, use the “Keyword Filter” search bar on the right side of the screen.

This is part of our A-Z for Operators series.

WaterOperator.org Staff Interviews Illinois Small Systems

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This past year, WaterOperator.org program director Steve Wilson and his staff were out and about in rural Illinois talking to water and wastewater operators about their struggles as well as their strategies. The interviews were part of a ISAWWA Small Systems Committee (SCC) initiative to bring to light the significant challenges encountered by small systems across the state. 

The results of these interviews were published as a series of eight articles entitled "Putting the Focus on Small Systems" in the Fall 2017 edition of ISAWWA's Splash magazine. Each article describes the unique challenges encountered by a specific system.

In the small town of Monticello, for instance, water works manager Scott Bailey (shown above with WaterOperator staff member Alison Meanor) describes how he manages an aging distribution system while tackling arsenic compliance issues. And in the small communities of Beason and Chestnut, Chair of the Water District Board Mark Carlin shares how the board proactively reached out to RCAP staff for help with funding much-needed infrastructure improvements. 

Many thanks to the operators, board members, technical assistance providers and government officials who agreed to meet with us and talk about their systems!  

EPA’s Arsenic Rule Results in Fewer Incidents of Cancer

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A recent New York Times article reports that the EPA’s revised rule on arsenic contamination in public drinking water systems has resulted in fewer lung, bladder and skin cancers. This finding, published last month in Lancet Public Health journal, is the result of a study that compared the urinary arsenic levels of over 14,000 people in 2003, before the new rule went into effect, to those in 2014, well after the rule had been fully implemented. The researchers found a 17 percent reduction in arsenic levels in this time period and they estimate that this reduction has resulted in 200-900 fewer lung and bladder cancers and 50 few skin cancers annually.

This finding is reassuring to water systems that have spent time, money and effort on arsenic rule compliance – it is always good to know that regulations are truly making a difference in the lives of community members.

It also highlights the importance of water systems, and especially those with groundwater sources, working with their local and state officials to determine the best way to test for arsenic and, if necessary, treat their water supply.  And because two water systems with similar levels of arsenic in their source water often need two entirely different types of treatment technology, and because these technologies can be expensive, knowledge about arsenic compliance, treatment and funding sources is essential.

Luckily, WaterOperator.org can help point you in the right direction when you choose "arsenic" as the category in our document database. A good first stop is also this EPA webpage which offers lots of resources and tools to operators, such as a rule summary and steps to take towards compliance.

Featured Video: Arsenic Treatment in a Rural Town

Over time, low levels of exposure to arsenic can result in cancer. This is a sobering fact for anyone, but it's particularly challenging for small rural towns with arsenic in their drinking water. When neither the utility nor the residents have access to other water options, treatment is of the utmost importance. But because arsenic doesn't cause taste or odor issues, or produce immediate health effects, getting that treatment in place can sometimes be difficult. Learning how other small utilities did it can help. In this week's video, the manager of a small rural utility in Montana introduces his utility and describes how they chose to put arsenic treatment in place for their system.

For more on arsenic in drinking water topics, see this USEPA factsheet (PDF), or search our document database using the category Arsenic.