Des Moines Water Works has had to begin operating its nitrate-removal system for the first time in five years after finding elevated nitrate concentrations in their water. The level of nitrate in the utility’s water supply fluctuates, and is attributable to excess nutrients on upstream farmland running off the land and entering Iowa’s rivers, lakes and streams.
The U.S. Environmental Protection Agency’s Safe Drinking Water Standard for nitrate is 10 milligrams per liter, and the nitrate levels in the rivers and groundwater used by the Des Moines Water Works have recently peaked at more than nine milligrams per liter.
The Water Works’ nitrate removal facility initially began operating in March 1992, but was last used in 2017. Drier conditions the past few years have limited the flow of nutrients into Iowa’s waterways, which has led to lower levels of nitrate in raw source water.
Use of the nitrate-removal system is significant because of what it means in terms of water quality and because of the expense. It can cost up to $10,000 a day to operate the nitrate-removal system, the Des Moines Water Works says.
The Des Moines Water Works is Iowa’s largest drinking water utility and provides drinking water to one-fifth of the state’s population.
Ohio State University researchers believe clean drinking water can be harnessed from nighttime air, when water is more prone to condensing. They have been developing methods for capture with the aid of some unusual experts: desert lifeforms.
The pointy tips and sharp spines on cacti collect water from nighttime fog and funnel it town to the plants roots. Desert grasses do the same with pointed blades. Beetles collect water on their backs, which feature water-repellant and water-attracting spots that push the water towards the bugs’ mouths. These features help the plants and insects survive in harsh, low-water conditions.
The researchers, led by Bharat Bhushan, professor of mechanical engineering at Ohio State, have been experimenting with materials, shapes and textures using 3D printed models in foggy enclosures. They have already determined that conical shapes and grooved textures are efficient water collection methods and hope to test prototypes in deserts outside the lab as they continue to develop designs. They published their findings so far in Philosophical Transactions of the Royal Societyin late December.
The final products of their work could have implications for water-scarce areas, where strife over clean water will only worsen with climate change. Water captured by such devices could supplement the drinking water supplies of private homes or whole communities.
“Water supply is a critically important issue, especially for people of the most arid parts of the world,” Bhushan said in a Science Daily report. “By using bio-inspired technologies, we can help address the challenge of providing clean water to people around the globe, in as efficient a way as possible.”
Day Zero is coming for Cape Town, South Africa, and it’s just as scary as it sounds.
Day Zero is the term officials have given to the day, April 16th, that the tourist city is expected to run out of water. Beginning today, city officials are enforcing stricter water restrictions in order to stretch the supply further. Each person will be allotted to 13.2 gallons of consumption per day and those found in violation will be subject to steep fines.
After about three years of below-average rainfall, the city’s dams are less than 25 percent full. Cape Town’s population has nearly doubled in the past 20 years as well, putting additional stress on natural resource supply. Residents may still be able to collect water from local springs and pumps after the taps are turned off on Day Zero but can expect a strong police presence. Reporting from National Public Radio states that South African police and soldiers plan to guard over 200 natural spring and waterhole sites in the city after Day Zero, limiting each person’s supply to 6.6 gallons.
At present, just 55 percent of Cape Town residents are honoring the city’s water consumption restrictions. Sitar Stodel is a 26 Cape Town resident that was interviewed by NBC. She described what she’s seen, “People are still watering their lawns, filling their pools and bathing. They seem happy to just pay the fines. It’s so upsetting. I think ‘Day Zero’ is inevitable, we’re at the point of no return. Cape Town will just have to deal with the consequences that day when it arrives.”
University of Iowa facilities management received notice on February 1 that its drinking water system contains levels of Total Trihalomethanes (TTHM) that exceed the federal drinking water standard.
In an email sent out to University faculty, staff and students on February 9, it was reported that the drinking water tested on average between 0.081 and 0.110 mg/L over the last year. The U.S. Environmental Protection Agency’s maximum contaminant level (MCL) for TTHM is 0.08 mg/L.
The notice read, “You do not need to use an alternative (e.g., bottled) water supply. Disease prevention specialists with University of Iowa Hospitals and Clinics say special precautions are not necessary.”
University officials cautioned, “However, some people who drink water-containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous system, and may have an increased risk of getting cancer.”
A study by the California Department of Health suggests that even short-term exposure to high TTHM levels in drinking water can have serious consequences for pregnant women. Scientists monitored 5,144 women during their first trimester of pregnancy. Participants who drank five or more glasses of cold home tap water containing 0.075 mg/L or more of TTHM had a miscarriage rate of 15.9 percent. Women that drank less than five glasses per day or who had home tap water with less than 0.075 mg/L TTHM had a miscarriage rate of 9.5 percent.
A reverse osmosis filtration system for the University of Iowa drinking water supply is currently in its design phase. Facilities management expects to have the new system up and running within the next 18 months. Officials say it will help address Iowa’s nitrate problem and filter out naturally occurring organic matter, resulting in fewer TTHM.
IowaWatch’s 2016 investigative work titled, “Crisis In Our Wells” is a multiple-part special report which explores Iowa’s rural well water contamination problem.
According to the report, an estimated 288,000 people rely on private wells for their water supplies. However, rural well water quality is not regulated, so many well owners may not know what is in the water they’re drinking. IowaWatch spent much of 2016 testing for nitrogen, bacteria, arsenic and lead in southwest Iowa private wells, and found that a large number had high nitrate and bacteria levels.
The U.S. Environmental Protection Agency’s health standard for nitrate contamination is 45 milligrams per liter. IowaWatch, which is a nonpartisan, non-profit news organization, tested 28 wells in May and June. Eleven of the tested wells had nitrate levels above 45 milligrams per liter, with one rural home’s water coming in at 168 milligrams per liter. Some wells contained trace amounts of arsenic and lead, while fifteen wells had unsafe bacteria levels.
County sanitarians that perform tests for these contaminants told IowaWatch that they often have trouble convincing homeowners that testing well water is important. Sherry Storjohann is an environmental health specialist that has been testing wells in Crawford and Carroll counties for a quarter century.
Storjohann said, “What’s out of sight is out of mind.” She explained, “I have so many people with hand-dug wells that say they’ve got the best tasting water, the clearest water, the coldest water. Yet, what they realize after they test is just how unsafe that water is.”
Recent research from the University of Iowa Center for Health Effects of Environmental Contamination found that nitrates in drinking water can lead to birth defects among pregnant women, certain types of cancer and thyroid problems. Bacteria in drinking water is not necessarily harmful to residents but can be a sign that the well is open to outside contaminants such as agricultural runoff, vermin or septic system leaks. The health risks associated with low levels of lead and arsenic are unknown, but the EPA sets those contamination limits at zero.
In 1987, Iowa legislature established the Grants to Counties Program as a part of the Iowa Groundwater Protection Act. The program provides funds to county health departments to provide well-related services to residents. All of Iowa’s counties, except for Marshall county, participate in the program. Funds for the program are generated by fertilizer and pesticides taxes and are split equally among counties each year. The money can be used for total nitrate, coliform bacteria as well as arsenic testing in private wells.
Carmily Stone is bureau chief of the Bureau of Environmental Health Services at the Iowa Department of Public Health. She said, “Some counties don’t spend all of their money, and some counties go through their money rather quickly.”
Spending can vary for several reasons. Some counties have more rural water unities while others have more private wells, other counties simply do not have enough public health employees to provide services to everyone. Beginning in 2016, Iowa legislature added a mid-year funding reallocation for those counties that do not spend all of the Grants to Counties money.
Stone said, “We will look at the spending patterns of the counties. If there are counties that have already spent their money, that’s awesome. We want them to spend it all. But if there are counties that still have money left, then we will look at that and say, ‘Okay, how much money is still here?’ If there is quite a bit of money still sitting there, then we will consider a reallocation plan.”
Stone said that those funds leftover are given to counties that have spent all of their money for the year.
Despite the availability of free testing services and health risks associated with contaminated water, environmental health specialist Storjohann said that some people do not consider the issue a priority. Storjohann said that her parents and grandparents never tested their private wells. She said, “They were of the adage: ‘We’ve been drinking it this long, you know. It’s never harmed us.”
Storjohann continued, “I’ve gotten to the point now in the last number of years where I actually send out a personal letter to homeowners trying to explain our services, hoping to generate that interest and make them understand the good service this is and what we can provide and that this is all for their benefit.”