On Sept. 27, the Environmental Working Group—a self-described nonprofit, nonpartisan organization dedicated to protecting human health and the environment, based in Washington, D.C.—released a report titled, “Toxic ‘Forever Chemicals’ Detected in Drinking Water Supplies Across California.”
The lead paragraph in that report states, “Drinking water sources for 74 community water systems serving 7.5 million Californians are contaminated with the highly toxic fluorinated chemicals called PFAS, according to an Environmental Working Group review of the latest state data.” We reviewed the report, which found that the water supplies managed by both the Desert Water Agency (serving most of the western end of the Coachella Valley) and the Coachella Valley Water District (serving a large portion of the central and eastern valley) tested positive for some levels of PFAS chemical compounds. In the case of the DWA, the test results referenced a maximum PFAS test result of 70.2 ppt (parts per trillion), but in one well only. One CVWD well returned a reading of 5.2 ppt.
However, reading beyond the headline, we found this: “The water systems conducted the tests between 2013, when the EPA ordered one-time nationwide sampling for PFAS, and this year, as the state moves toward establishing its own health advisory levels for the two PFAS compounds covered by the EPA’s advisory. EWG’s list shows not the current level of contamination in customers’ tap water, but rather the extent of contamination in drinking water sources identified since 2013. Maximum detection levels reported to the California State Water Resources Control Board and the EPA are a snapshot of what was in the water when it was tested, not necessarily what is coming out of taps now.”
That’s a relief. Or is it? Why the alarmist headline?
“We heard about the EWG report … but they do this every year,” said Ashley Metzger, outreach and conservation manager at the DWA, in a phone interview. “Some of the standards that they include on their site are actual real federal and state standards (for allowable contaminant levels in drinking water). Other standards that they include are ones that they make up. So we’re always kind of leery and looking out for it to make sure that (their reports are) appropriate and fact-based, and if they used their own standard, they’re clear about it. It can be pretty misleading to folks.”
What did Metzger have to say about that DWA well reading cited in the report?
“I know that we had an issue with one of our samples at Well 26, where it was registering a read,” Metzger said. “In two following tests, we were ‘non-detect.’ There’s a provision in the sampling guidance from the (California State Water Resources Control Board) Division of Drinking Water that indicates if you take two additional samples that don’t show the presence of the chemical, then they’ll disregard the original sample.”
Metzger added: “When you’re talking parts per trillion, that’s very, very, very minute traces—and you’re talking about a very ubiquitous substance. You know, those (chemicals) are present in a lot of different materials that we come into contact with on a daily basis, (like) food wrap, the insides of paper cups sometimes, Teflon pans, Scotchgard repellents, clothing, cosmetics, sunscreen and all sorts of stuff. So samples can sometimes be contaminated. … We don’t know exactly what went wrong (in this case), if it was a false positive or what. We do feel secure that the follow-up results are helpful. We not only did those two follow-ups on that well, but also we did a second … sampling that showed ‘non-detect’ at that well.”
Katie Evans, the director of communications and conservation for the CVWD, pointed out that the EWG is an advocacy group. “When you’re advocating for a cause, what you want to do is bring attention to that cause—and so that’s what they have done … and very well, it seems.”
Evans said the CVWD’s water supplies are safe—and that testing proves it.
“We’re testing for all those PFOS and PFOA chemicals according to our state regulatory requirements,” Evans said. “The state has come out recently with new testing requirements for those specific issues, and so we’ve been testing against those—but we haven’t had a problem. We haven’t exceeded, and so we haven’t had to treat for anything. But if there was, in the event that we exceeded any contaminant level, then we would look at treating the water to bring it into drinking-water standards.”
DWA said the state’s testing requirements have forced water agencies to be proactive.
“We’re not waiting for anything,” she said. “Basically, we have orders from the state of California to conduct this testing, because of the fact that we are close to the airport—and we’ve done the testing. We’re doing testing. We have written documentation from them.”
Evans said the CVWD is constantly testing its water supplies.
“I want to assure people that the drinking water is safe. In our view, the definition of the word ‘safe’ is that it meets all the drinking water standards, both state and federal. CVWD collects water samples every day, 365 days a year.
“It seems that the discussion the EWG wants to have is whether the levels need to be changed, and that’s fine. They’re advocating for that. But CVWD provides drinking water that meets all federal and state standards, and the drinking water is safe. Water quality is a huge, huge priority over here. It’s what we do. We provide drinking water, and it’s not lost on us that the public counts on us to provide them with a safe supply.”