Interstate Commission on the Potomac River Basin - ICPRB

Interstate Commission on the Potomac River Basin - ICPRB Protecting and preserving the Potomac through science and cooperation. The federal government also is a member.

Authorized by an Act of Congress in 1940, the Interstate Commission on the Potomac River Basin is an advisory, non-regulatory interstate compact agency of the Potomac basin states of Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia. ICPRB was formed in response to extreme pollution levels that required a regional, cooperative response by all the jurisdictions. In 1970,

amendments to the compact empowered ICPRB to address not just pollution issues, but water resources and related land issues by two or more jurisdictions. The river’s water quality has in many ways vastly improved, but threats to the river (population increases, land use change and the growth of impervious surface, chemical contaminants, and nutrient and sediment enrichment) require regional attention. The regional efforts needed to address these challenges help to inform ICPRB’s Strategic Plan. Our mission is to protect and enhance the waters and related resources of the Potomac River basin through science, regional cooperation, and education. Considered the “Nation’s River,” for more than six million basin residents, the river plays an important role in the lives of all. Through regional cooperation and partnerships, ICPRB is protecting the river and improving the quality of life in the watershed. ICPRB jurisdictions are represented by appointed Commissioners. Commission staff includes professionals from various disciplines, including environmental engineers, aquatic ecologists, biologists, and professionals in communications. One staff member works directly with the Chesapeake Bay Program out of their Annapolis, Maryland, office.

Worried about your lawn this summer? WTOP News has tips on lawncare during a drought. In summ-ery: "leaf" it alone.
06/10/2026

Worried about your lawn this summer?

WTOP News has tips on lawncare during a drought.

In summ-ery: "leaf" it alone.

An assistant professor of turf grass science said the best thing to do for your lawn during the D.C. area’s drought, is to back off.

In celebration of Chesapeake  , we're sharing twelve bioregions of the Chesapeake Bay as they relate to stream macroinve...
06/09/2026

In celebration of Chesapeake , we're sharing twelve bioregions of the Chesapeake Bay as they relate to stream macroinvertebrates (aka creek critters). This includes insect larvae, snails, and water beetles.

Differences between bioregions in their natural hydrology, topography, and climate affect the composition of macroinvertebrate communities and how they respond to stream degradation.

Find the map explorer here: https://icprb.maps.arcgis.com/apps/instant/exhibit/index.html?appid=ccf21f75e61a45ccb09b65ea75d5e666

Looking for an activity this weekend!? We just had some spots open up in our Catch, Clean and Cook Fishing Clinic for Sa...
06/05/2026

Looking for an activity this weekend!? We just had some spots open up in our Catch, Clean and Cook Fishing Clinic for Saturday morning at Pohick Bay. Everyone who attends goes home with a free rod and reel! 🎣

Join the Potomac River Commission and "Rivah Sistah" Patricia to learn the fishing basics, from casting to cooking your catch!

06/05/2026

Earlier this week, The Metropolitan Washington Council of Governments issued an indefinite drought watch. Despite some heavy downpours this spring, we’re stll facing drought conditions across the Potomac River region.

Top 5 things to know about the current drought watch
1️⃣ 40% of the Potomac River region is experiencing severe drought conditions or worse
2️⃣ Summer and fall months are when the river typically flows lower*
3️⃣ Locals are being asked to voluntarily decrease their water usage
4️⃣ There is an above-normal probability we need to use the Washington metropolitan area’s backup water supply reservoirs during the summer and fall this year*
5️⃣ Rain in the watershed is 7 inches below normal for the last calendar year.*

*Source: Interstate Commission on the Potomac River Basin - ICPRB

💧 To stay in the loop on this issue and more river news sign up for our emails at the link in comments

A Drought Watch has been declared for the metropolitan Washington region. Authorities are asking for voluntary water con...
06/04/2026

A Drought Watch has been declared for the metropolitan Washington region. Authorities are asking for voluntary water conservation among residents and businesses in the region. Link to ICPRB's news release in the comments.

The National Drought Mitigation Center Drought Monitor Map released this morning showed the area in Extreme Drought conditions was reduced to 3.4%, a small improvement over last week’s 8.5%. The majority of the watershed remains in Moderate or Severe Drought conditions. A small section in the northwest corner of the watershed is experiencing no drought at all. Lucky them!

After a nice recovery last week, river levels have fallen into the “normal” range but are expected to continue to fall.

Rain in the watershed is 7 inches below normal for the last calendar year.

Minimal rain is expected over the next week.

Despite recent rainfall, drier-than-usual conditions are expected to persist in the Potomac Basin and DC metro region. A...
06/03/2026

Despite recent rainfall, drier-than-usual conditions are expected to persist in the Potomac Basin and DC metro region.

A Drought Watch was put into effect today by the Metropolitan Washington Council of Governments (COG). The regional Drought Watch applies to nearly six million residents across the District of Columbia, suburban Maryland, and Northern Virginia.

While there is an adequate supply of water in the Potomac River and backup reservoirs, residents and businesses are encouraged to practice wise water use by taking simple, voluntary steps to reduce water use and help protect the region’s water resources if dry conditions persist.

Small actions make a big difference, so do your part, and spread the word.

For more information on the drought watch and the region's drought response planning, visit COG's website: https://www.mwcog.org/newsroom/2026/06/02/cog-declares-regional-drought-watch-encourages-wise-water-use/

06/02/2026

The ICPRB FY26 Third Quarter Business Meeting is coming up on Tuesday, June 16, 2026. The meeting will be held virtually.

Commissioners will discuss the budget and nominate officers for FY27, and get updates on ICPRB’s work. Find the draft agenda on our Business Meetings site on our webpage.

The public is invited to attend virtually or provide public comment. Please contact us by Friday, June 12 to register.

The ICPRB FY26 Third Quarter Business Meeting is coming up on Tuesday, June 16, 2026. The meeting will be held virtually. Commissioners will discuss the budget and nominate officers for FY27, and get updates on ICPRB’s work. Find the draft agenda on our Business Meetings site on our webpage. The.....

Roadtrip, anyone? 🚐💨These two case-building caddisfly larvae joined ICPRB staff at a recent Earth Day festival. They wow...
06/02/2026

Roadtrip, anyone? 🚐💨

These two case-building caddisfly larvae joined ICPRB staff at a recent Earth Day festival. They wowed the crowd with their RV-driving skills as they carried their stylish homes on their back.

The creative caddisfly larvae construct homes around themselves out of whatever they find, including sticks, leaves, rocks… and even jewels! 💎

They then drag them around like your grandpa’s massive RV. This provides protection and anchoring in the strong stream currents.

The sweet ride also doubles as a convenient cocoon. Just like grandpa, once the caddisfly is ready for their next stage in life, they attach their mobile home to the nearest surface and settle down. As an adult caddisfly, their sole purpose is to fly around and find other caddisfly to make more baby 👶 caddisflies and then die.

Have you found a caddisfly in your local stream? 🌊Caddisfly larvae are sensitive to pollution, so if they are present in a stream, it’s generally a sign of good water quality.

🎥: caddisfly race (ICPRB)
📸 1: Kids at the festival (ICPRB)
📸 2: Adult caddisfly ()
📸 3: Caddisfly life cycle (Rich Mason/Umea University)
📸 4: Caddisfly jewelry (Artificial Official)

Address

401 N. Washington Street, Ste 300
Rockville, MD
20850

Opening Hours

Monday 8am - 4pm
Tuesday 8am - 4pm
Wednesday 8am - 4pm
Thursday 8am - 4pm
Friday 8am - 4pm

Telephone

+13019841908

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