Archive for the ‘Water Quality’ CategoryJune 27, 2014
With recent, heavy rains, all eyes are on the metro area’s rivers. With the water so high and visible, you may have recently noticed the foam floating on top of the Raccoon River. It may look like there was an upstream truck spill carrying dish detergent, but in fact, it is not soap causing the foam you are seeing on the river.
Detergents can produce foam, but usually the foam caused by detergents is white. The light tan foam recently seen in the Raccoon River typically occurs when decaying organic matter enters the water or is washed into the rivers and streams and begins to decay. This forms soap-like molecules that are attracted to water on one end and oily substances on the other end. The attraction of these substances to water reduces the surface tension on water. Surface tension of water creates the “skin” on the surface of water that allows water strider insects to skate across the surface of the water and not sink. When this skin becomes weaker, wind and turbulent water can easily break this skin. The soap-like molecules (surfactants) hold onto fats and oils on one side and water on the other with air trapped inside. The stronger the soap and water layer, the larger and more stable the bubbles. Eventually, bacteria break down these substances so they can no longer form bubbles.
When living things die and decay, cells breakup. This occurs in the alimentary tract (the tubular passage extending from the mouth to the anus, through which food is passed and digested) of animals and is eliminated with the fecal matter. Therefore, a high concentration of this waste contributes to the formation of the foam you are seeing on the Raccoon River right now. This can come from poorly operated waste treatment facilities and untreated animal waste.
Testing at Des Moines Water Works’ laboratory shows low phosphorus concentrations, indicating the foam to be from the decay of natural vegetation and waste products, rather than from direct human activity. Des Moines Water Works monitors its source waters daily for contaminants to determine which source to use and how to best treat the water in order to provide safe and clean drinking water to its customers.
Des Moines Water Works is committed to delivering safe, affordable and abundant drinking water to our customers. Safe drinking water is treated water that has been tested for harmful and potentially harmful substances and has met or exceeded drinking water quality standards set by the United States Environmental Protection Agency (EPA) and the State of Iowa. The EPA sets drinking water standards to define the limits of contaminants considered safe for drinking water. These levels are based on studies of the health effects associated with each contaminant and include a sufficient safety margin to ensure that water meeting these standards is safe for nearly everyone to drink. The Consumer Confidence Report is an annual water quality report that helps customers understand the quality and safety of tap water provided by Des Moines Water Works. The current Consumer Confidence Report is now available on Des Moines Water Works’ website at http://www.dmww.com/upl/documents/library/2014-ccr.pdf. If you would like a printed copy of the Consumer Confidence Report mailed to you, please contact a Customer Service Representative at (515) 283-8700. If you have any questions about your drinking water, please contact Des Moines Water Works at (515) 283-8700.Labels: Consumer Confidence Report, Des Moines Water Works, Des Moines waterworks, DMWW, water quality Posted in Customers, Source Water, Water Quality April 21, 2014
On April 26, communities across the United States are teaming up with the Drug Enforcement Administration (DEA) to give the public the opportunity to safely dispose of expired, unused, and unwanted prescription drugs.
Traditional methods for disposing of unused medications – flushing them down the toilet or throwing them in the trash – both pose threats to our groundwater supplies. Additionally, leftover medications are highly susceptible to diversion, misuse, and abuse. Studies show that a majority of abused prescription drugs are obtained from family and friends, including from the home medicine cabinet.
Do your part to help keep our groundwater clean and your family safe! Dispose of all your expired, unused and unwanted prescription drugs on April 26, at a drop off location near you. For drop off site locations, visit the DEA website or call 1-800-882-9539. The DEA cannot accept liquids or needles or sharps, only pills or patches. The service is free and anonymous, no questions asked.
To learn more about what you can do to protect your family and the environment from leftover medications, please visit The Groundwater Foundation website.Labels: Des Moines Water Works, Des Moines waterworks, Disposal of Prescription Drugs, DMWW, water quality, Watershed Posted in Source Water, Water Quality April 7, 2014
Spring melting has caused significant water quality concerns for Des Moines Water Works, in particular ammonia present in our rivers from livestock runoff and other upstream land uses. Many customers may have noticed a chlorine taste and smell in their drinking water. Weeks of disinfection treatment has been necessary to reduce runoff impacts; however, disinfection has its own risks, including potential health risks if continued over the long term.
Des Moines Water Works aggressively and continuously monitors for the presence of drinking water contaminants. Tests indicating a “snap shot” of drinking water quality are taken often in the Des Moines Water Works system. Testing results received on March 21, 2014, show Des Moines Water Works exceeded the regulatory standard for Total Trihalomethanes (TTHM). The standard for TTHM is 0.080 milligrams per liter (mg/L), or 80 parts per billion. Des Moines Water Works’ result for TTHM during the monitoring period, which ended in the first quarter, was 0.090 mg/L in the Des Moines Public Water Supply (PWS) and 0.0926 mg/L in the Southeast Polk Rural Water District PWS.
“First and foremost, we take very seriously our responsibility to customers to provide a safe, reliable, and abundant water supply, and recognize that responsibility was not met here,” said Bill Stowe, CEO and General Manager. “Safe drinking water standards exist to protect public health – some for immediate health considerations, and others that protect against unwanted long-term effects. This exceedance falls within the second category. What is important here is that we respond with a sense of urgency to remedy the issue so it does not have the opportunity to become long-term. Our customers need to understand that there is not an immediate concern with respect to the drinking water – it remains safe to consume and customers do not need to use alternative sources of drinking water, nor use additional treatment techniques.”
Trihalomethanes are one of the most common disinfection by-products. Disinfection by-products form when chlorine used for disinfection reacts with organic matter present in the water. Some people who drink water containing Trihalomethanes in excess of the standard over many years may experience problems with their liver, kidneys or central nervous system.
The violation occurred due to the interaction between chlorine and organic matter in the water system.
“At the time of the violation, Des Moines Water Works saw elevated levels of ammonia and other organic matter in both the Des Moines and Raccoon Rivers,” said Stowe.
Disinfection with chlorine is more difficult when ammonia is present in source waters. Ammonia consumes chlorine, leaving it unavailable for disinfection. This requires adding additional chlorine to eliminate the ammonia and obtain proper disinfection during the final stage of treatment. For that reason, chlorine levels have been purposefully higher since early January. Elevated levels of organic matter, at a time when chlorine is being dosed aggressively, causes the formation of the undesirable disinfection by-products.
High levels of organic matter and ammonia in the rivers are often the result of agriculture runoff, especially livestock operations and manure fertilized fields.
“Runoff into the Des Moines and Raccoon Rivers has once again created significant water quality and water treatment concerns,” said Stowe. “We are completely at the mercy of what is in our rivers each day.”
“Investing in multi-million dollar capital improvements to adjust treatment processes is one viable solution to eradicate similar violations in the future, but the source of the problem remains in our rivers,” said Stowe. “This should be a call to action for all central Iowans to advocate for cleaner source water and to question if voluntary water protection measures work.”
Des Moines Water Works customers will receive the public notice required by Iowa Department of Natural Resources in their April bill statement. Copies of the notices can be found here:
- Public Notice for all DMWW full and total service customers, except Southeast Polk, south of I-80
- Public Notice for Southeast Polk customers (Runnells and Southeast Polk, south of I-80)
The regulation requires averaging the samples obtained in the last four calendar quarters. Because of the high results in the first quarter of 2014, similar notices will be sent to customers in future quarters unless and until the average falls below the standard. Customers can expect three additional notices in 2014.Labels: Des Moines Water Works, Des Moines waterworks, DMWW, Total Trihalomethanes, TTHM, water quality Posted in About Us, Source Water, Water Quality February 20, 2014
Des Moines Water Works uses both the Raccoon and Des Moines Rivers as water sources. By using surface water, seasonal variations can occur. The recent warm-up in temperatures has caused increased runoff into our water supply, requiring Des Moines Water Works to use more chlorine to achieve the desired chlorine levels in the finished product.
Both rivers are currently experiencing elevated levels of ammonia. Disinfection with chlorine is more difficult when ammonia is present in source waters. Ammonia consumes chlorine, leaving it unavailable for disinfection. This requires addition of extra chlorine to eliminate the ammonia and maintain adequate disinfection. For these reasons, chlorine levels have been purposefully higher for the past three weeks. Chlorine levels in the water leaving Des Moines Water Works’ treatment plants are monitored continuously to ensure they do not exceed the maximum allowable limit set by Environmental Protection Agency (EPA).
Finished drinking water from Des Moines Water Works is safe to consume. Some people are more sensitive to these subtle changes in taste or odors. These conditions will improve as the weather stabilizes and levels of runoff decrease.
With the hustle and bustle of the holiday season, we should not forget another important December date. December 16 was the 39th anniversary of the signing of the Safe Drinking Water Act, a landmark law providing for the nation’s health, wealth, and welfare.
Even though drinking water in the United States is considered to be one of the safest in the world, water contamination still occurs. There are many sources of contamination, but in Iowa and for Des Moines Water Works, the primary source of contaminants (fertilizers, pesticides, livestock, and concentrated animal feeding operations) comes from land use. Make 2014 the year you engage in serious discussions locally and statewide about this growing problem. These should not be sterile discussions influenced by data and statistics – although alarming data and statistics exist. Healthy source waters and agriculture can co-exist. They must – both are critical to a sustainable future.
The presence of certain contaminants in our source water can lead to health issues, including gastrointestinal illness, reproductive problems, and neurological disorders. Infants, young children, pregnant women, the elderly, and immunocompromised persons may be especially susceptible to illness. Everyone and everything is connected to water. And, no one can afford to remain silent while water quality continues to degrade in Iowa. Seek out and understand the source(s) of your drinking water, what threats are relevant, and take action that will improve and protect these water resources. Information can be found on the DMWW website, www.dmww.com.
Holiday drinking doesn’t have to include sweet and creamy or spiked and spicy elixirs – sometimes water is all you need, especially if you serve it with good food and great conversation. So this holiday season, celebrate with a toast to accessible, affordable and safe drinking water. And in the New Year, become an advocate for clean water in Iowa.
Cheers from Des Moines Water Works!
Des Moines Water Works uses the Raccoon and Des Moines Rivers as water sources. By using surface water, there can be some seasonal variations that occur. The treatment process should eliminate the variation in finished water, but sometimes there will be a slight change some customers may notice. For example, there may be a slight increase in smell or taste, especially during a river’s thaw. Although the water is safe to drink, DMWW adjusts its water treatment processes to remedy the situation. To help reduce tastes and odors in your drinking water, DMWW will make timely switches between our source waters as needed to insure the highest quality of water possible. In addition, powdered activated carbon is added at the Fleur Drive Treatment Plant. This material absorbs taste- and odor-causing compounds before settling out in the treatment process. The effective use of chlorine also destroys objectionable tastes and odors.
Some people are more sensitive to subtle changes in taste or odors. To help dissipate the taste and odor, try storing water for drinking in a pitcher in the refrigerator. If you are storing drinking water for convenient use, here are a few things to help prevent taste and odor issues. Store water in a glass container, as plastic can impart taste or odors to the water. Also make sure the container has a good seal. Store in the refrigerator as water will have less flavor when chilled. If the water has sat for a while, it may be flat. If this is the case, pour it back and forth between containers or shake it to help aerate the water. This will help to add oxygen to the water and remove the stale, flat flavor.Labels: Des Moines Water Works, Des Moines waterworks, DMWW, Taste and odor, water quality Posted in Customer Service, Source Water, Water Quality November 6, 2013
Did you know that Des Moines Water Works has owned about 100 acres of farm land at Maffitt Reservoir Park since 1942? In keeping with DMWW’s mission, and knowing that what we do on the land impacts the quality of our source water, we seek to adopt agricultural practices that provide protection to the water and soil resources under our ownership.
This fall, a cover crop was planted on DMWW’s Maffitt farm land. The cover crop was applied using a helicopter that planted seed in a standing soybean field. A mixture of rye (cool season grass/grain non-legumes) and hairy vetch (cool season annual legume) were planted.
Cover crops have been around for centuries, but are gaining in popularity because of their ability to control erosion, improve soil water moisture content, and the natural filtration of water through the soil profile. When the cover crop decays, it provides organic matter to produce beneficial soil organisms for soil fertility and soil health. Healthy soils improve the infiltration of water, leading to less flooding as well as reduced soil erosion and nutrient (nitrogen and phosphorus) leaching. According to an Ohio State University Extension report, Using Cover Crops to Improve Soil and Water Quality (2009), a pound of soil organic matter has the ability to absorb 18–20 pounds of water, reduces nutrient and pesticide runoff by 50% or more, decreases soil erosion by 90%, reduces sediment loading by 75%, and reduces pathogen loading by 60%.
By using cover crops and reducing reliance on agrichemicals for crop production, we help protect the health of family and friends and reduce water quality concerns arising from non-point pollution attributed to farming practices. At a time when the Raccoon and Des Moines River watersheds suffer from serious degradation due to nutrient contamination, this shift in agricultural systems can play a significant and positive role in revitalizing Iowa’s river systems. For more information about cover crops, visit Practical Farmers of Iowa at http://www.practicalfarmers.org/programs/Field-Crops_cover.php or Midwest Cover Crops Council at http://www.mccc.msu.edu/.
On August 20, the Iowa Environmental Protection Commission (EPC) held their regularly scheduled monthly meeting at Des Moines Water Works (DMWW). Prior to the business meeting, Commissioners Couser, Rastetter, Sinclair, Smith, and Ver Steeg, Iowa Department of Natural Resources (IDNR) staff, and representatives from environmental and agricultural organizations toured Des Moines Water Works’ Fleur Drive Treatment Plant to gain a better understanding of the treatment process. DMWW staff provided the Commissioners an insight into the condition and challenges of source waters used for drinking water for the more than 500,000 people in central Iowa.
Challenges expressed by DMWW included everything from high nitrates to flood events. However, most questions and comments stemmed from the exceptionally high nitrate levels this year. DMWW staff emphasized that even if nitrate levels are currently low, the combination of nitrates and phosphorus in the rivers and increasing temperatures will again challenge DMWW due to algae blooms. Algae can cause taste and odor problems and require additional filter maintenance, which slows the treatment process and reduces production capacity.
The EPC is a panel of nine citizens who provide policy oversight over Iowa’s environmental protection efforts. EPC members are appointed by the Governor and confirmed by vote of the Senate for four year terms.
Approximately 10,000-12,000 RAGBRAI riders and their support teams camped overnight in Water Works Park July 23, 2013. One cyclist was overheard remarking that Water Works Park was “by far the coolest camp” he’d experienced in his 16 years of riding.
While riders and campers enjoyed the nature of the park and the close community it provided, the “hot” commodity was a chilled water station where bicyclists could fill their reusable water bottles with ice cold tap water. Recently designed by Des Moines Water Works staff, the water station connects to any water supply and utilizes ice to cool the tap water flowing through a 100’ coil to four bottle filling faucets. Chilled water was extremely popular as the riders are accustomed to drinking lukewarm tap water all day long.
Two additional water stations were strategically positioned in the campground to provide thousands of gallons of water for the campers’ needs. Riders were extremely appreciative of the plentiful supply of water allowing them to clean up and board a bus to experience the festivities in downtown Des Moines.
Cyclists and their support teams got an early start July 24 and by mid-morning, few traces remained of the epic camp-out the night before. From all accounts, cyclists enjoyed their stay in Des Moines and the hospitality offered by the entire community. In return, DMWW thanks RAGBRAI-ers for being great stewards of Water Works Park. Come back and enjoy!