Watching the water supply:

Southwest Washington bearing brunt of dry conditions

Although we don't expect much rain this time of year, one area of the state stands out for being drier than usual: Southwest Washington and most of the Olympic Peninsula.

The July 19, 2018, U.S. Drought Monitor map classifies

southwest Washington as having moderate drought-like

conditions. Much of the rest of the state is considered

abnormally dry.

The U.S. Drought Monitor map, one of the tools we use to assess state water supply conditions, classifies much of the region as experiencing moderate drought-like conditions. The map is updated weekly and available on our statewide water supply conditions webpage.

Streamflow data also point to low flows in the region.

We’re seeing many rivers and streams in southwest Washington run at record low levels. The Chehalis River near Grand Mound is running at 113 cubic feet per second—a flow level in the 1st percentile, meaning flows are so low they are exceeded 99 percent of the time for this time of year historically. The Willapa River near Willapa is at 20 cubic feet per second, which is in the 1.5 percentile, meaning the flow is exceeded 98.5 percent of the time for this time of year historically. Irrigators, fish and aquatic habitat are most affected by these low flows.

Citing low flows in the Cowlitz River, the city of Kelso has asked its residents to take  

The Chehalis River winds its way west of Chehalis (July 19, 2018). We're
seeing record low flows on parts of the river. 

voluntarily water conservation measures until water levels in the municipality’s water source improve. To the north, the city of Forks and two small Jefferson County water systems are also asking their customers to follow voluntary conservation measures.

NOAA’s climate prediction center is predicting warm, dry conditions for the rest of summer. We are closely monitoring water supply conditions and working with other state agencies to track impacts. If you’d like more detail, read our water supply webpage.

Are we in a drought emergency?

Under Washington State law, emergency drought conditions are identified when water supply in an area has or is predicted to have 75 percent of normal water supplies AND undue hardships expected as a result. 

Drought emergencies are declared using a formal process based on statute. At this time, we have not declared a drought emergency anywhere in the state.

A rain-fed water system

The hydrogeology of southwest Washington is unique. Water supplies rely heavily on rain and less on snowpack from the Cascade and Olympic mountains. This means the region’s water supplies are more sensitive to above-average temperatures and below-average precipitation like we’ve been experiencing.

The effects of the unseasonably warm and dry weather in May led us to issue water use curtailment notices. We asked 88 junior water right holders—mostly irrigators—in the Chehalis River basin to stop using river water until flows increase.  This is the fourth consecutive year we have issued curtailment orders or notices for junior surface water irrigation uses in the basin. It was also among the earliest dates we have curtailed this group of water users.

Office of Chehalis Basin

In 2016, the Legislature created the Office of Chehalis Basin within Ecology. While a main focus of the new office is to pursue long-term flood-damage reduction and restore aquatic habitat in the state’s second-largest river drainage system, the Office of Chehalis Basin is also tracking the impacts of the dry conditions.

By Kristin Johnson-Waggoner, communications manager

Don't let ground-level ozone ruin your summer fun

Summer is definitely here. It’s hot, it’s sunny, it’s the time of year you want to be outside. With all that fun in the sun, though, can come a form of air pollution we’re definitely not excited about: ground-level ozone. 

Ecology keeps a close eye on ground-level ozone levels around Washington and issues advisories when levels rise to a point that could affect people’s health. Let’s talk about what ground-level ozone is, what it can do to your health, how you can help prevent it, and how to find out when levels are unhealthy.

Why should I care about ground-level ozone?

First, let’s distinguish the difference in ozone and ground-level ozone.

• “Good” ozone forms naturally one to 30 miles above the Earth’s surface. This ozone layer protects life from the sun’s harmful rays.
• “Bad” ozone forms at ground-level. It is the main ingredient of smog and can cause a plethora of health problems.

Today, we are going to talk about how ground-level ozone forms, the health problems it causes, and what to do about it.

How it forms

Ground-level ozone is a gas created by a chemical reaction between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. Vehicle and industrial emissions, gasoline vapors, chemical solvents, and natural sources emit NOx and VOCs that help form ground-level ozone. 

Obviously, urban areas will see higher amounts of ground-level ozone because they tend to have more air pollutants. But rural areas may not be spared from the health effects of it. Ground-level ozone takes time to form, and while it’s forming the wind can carry it far away. So, even if you live in the country, you can still be exposed to ground-level ozone.

What it can do to your health

Unhealthy amounts of ground-level ozone can affect everyone, but people with lung disease, children, older adults, and people who are physically active are especially sensitive. Ground-level ozone can:

• Irritate your throat.
• Cause coughing, wheezing, and painful breathing.
• Inflame and permanently damage lung tissue.
• Aggravate asthma, emphysema, and chronic bronchitis.
• Increase the likelihood of pneumonia and bronchitis.

To protect your health, do less strenuous activities outdoors or stay inside until it cools down. If you experience serious symptoms, see your doctor.

How you can help reduce ground-level ozone

On hot days when ground-level ozone is expected to reach unhealthy levels, take these extra steps to help reduce air pollution:

• Drive less. Combine errands or use public transportation.
• Switch to a zero emissions vehicle, walk, or ride a bike.
• Postpone travel until the weather cools when possible.
• Don’t use lawnmowers or other small engines during heat spells.
• Follow burn bans.
• Don’t barbecue or use your fire pit while it’s hot out.
• Don’t let your engine idle.
• Refuel your vehicle in the early mornings.
• Don’t paint or use aerosol sprays until temperatures cool off.

When it gets hot outside, keep an eye on Ecology’s Facebook page or Twitter account for air quality advisories or check Washington’s Air Quality Monitoring Network. 

To learn more about ground-level ozone and other air quality topics, visit Ecology’s website.
 
By Kim Vaughn / Air Quality

Watching the water supply

While you’re out there enjoying this warm and dry weather, there’s another side to the story that we’re continuing to track: How these conditions are impacting state water supplies.

We are seeing dry areas around the state. NOAA is forecasting summer to be even drier and warmer than normal, so our dry conditions are likely to persist until the fall rains return.

This map from USGS shows about half of the 

streamflows in our state are at below-normal levels.
Learn more about streamflows at our statewide
conditions webpage. 

Currently, parts of the state (mostly southwest Washington) are experiencing moderate drought-like conditions. See the U.S. Drought Monitor map below for more detail. However, storage reservoirs for drinking water and irrigation are in good shape.

People and the environment depend on a healthy water supply. Impacts from the current dry conditions will likely most affect irrigators and fish. We’ll continue to track conditions on our website and this blog.

Are we in a drought emergency?

While drought-like conditions are evident, we’re not declaring a drought emergency at this time. Drought emergency declarations for the entire state or part of the state involve a formal, statute-based process. Conditions that could trigger a drought emergency are when water supply in an area is 75 percent of normal and there is an expectation of undue hardship because of deficient water supply. We are watching the situation closely.

Curtailment updates

We issue curtailment orders in parts of the state due to low flows in rivers and streams. Curtailing water use protects senior water right holders and adopted streamflows. Here’s an update:

• In June, we wrote about curtailing 300 junior water users along the Yakima River and its tributaries. Since then, the U.S. Bureau of Reclamation announced that senior and pro-ratable customers of project water will receive 100 percent of their water supply this summer. This is an improvement over June, when Reclamation had forecasted 96 percent. Due to this revision, which Reclamation attributes to reduced demand during the month of June, we are notifying the junior water right holders in the basin that they may resume their diversions. 

• In the Methow area, irrigators with interruptible water rights will likely be regulated when river levels drop close to minimum flows. We will provide these water users with a hotline to check if they are allowed to irrigate.

As always, visit our statewide conditions webpage for information on streamflows, temperature, precipitation, and more.

We use several tools to assess statewide water supply conditions, including a weekly map from the U.S. Drought Monitor. This week’s map shows abnormal dryness and parts of the state, mostly in southwest Washington, experiencing moderate drought-like conditions.

By Kristin Johnson-Waggoner, communications manager