Total Maximum Daily Loads and Advance Restoration Plans

When monitoring reveals that waterways do not meet Delaware’s water quality standards for their intended uses, as defined in Delaware’s Surface Water Quality Standards, they are added to a list of impaired waterways (Delaware’s 303(d) List). For each impaired waterway, the Federal Clean Water Act (CWA) requires states to develop Total Maximum Daily Loads (TMDLs)

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Wetlands and Waterways Permit Applications: Emergency Beach Renourishment

The DNREC Division of Watershed Stewardship requests a Water Quality Certification to conduct emergency beach renourishment activities along the north side of the Indian River Inlet.

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Division of Watershed Stewardship

The DNREC Division of Watershed Stewardship manages and protects the state’s soil, water and coastlines. It uses a comprehensive array of watershed-based programs to ensure proper stewardship of Delaware’s natural resources. Watershed Assessment and Management

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Chesapeake Implementation Program

The DNREC Chesapeake Implementation Program administers water quality focused programs and manages grants that fund projects within the Delaware portion of the Chesapeake Bay Watershed designed to reduce nonpoint source (NPS) pollution. The Chesapeake

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Swimming Advisory Caution

The DNREC Recreational Water Program monitors bacterial water quality at established sampling sites throughout the state from May through September. If bacterial sampling results exceed state standards, DNREC issues swimming advisories for Atlantic Ocean beaches, as well as for Delaware Bay beaches south of and including Lewes Beach and for Lake Como in Smyrna.

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Navigating the Depths: Inside the Delaware Bay’s Longest-Running Water Quality Monitoring Program

The Delaware Estuary Water Quality Monitoring Program, informally known as the boat run, is one of the longest-running water quality monitoring programs in the world.

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Water Quality Monitoring

The Division of Water monitors ambient water quality and multiple sites around the state to help support multiple goals of the Department. It also tracks the causes and effects of saltwater intrusion. Ambient Groundwater Monitoring The Division of Water is expanding the number of existing groundwater monitoring wells throughout

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Wetlands and Waterways Applications

A listing of recent applications to the DNREC Division of Water for wetlands and subaqueous lands permits, leases and certifications.

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Wetlands and Waterways Applications

The DNREC Division of Watershed Stewardship and the U.S. Army Corps of Engineers have applied for subaqueous lands permits and water quality certifications to conduct dredging and beach replenishment along Lewes Beach.

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Vibrio Control Plans

Vibrio is a naturally occurring bacteria present in high levels in seawater when temperatures are warm. It can cause serious illness in humans. The National Shellfish Sanitation Program requires Delaware to implement plans to reduce the risk of Vibrio illnesses from oysters harvested in Delaware. Vibrio — Vibrio parahaemolyticus (V.p.) — can

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Blue-Green Algae in Delaware

Blue-green algae blooms occur each year on Delaware ponds, lakes and some tidal freshwater areas. Because they can have harmful effects on people and animals, the state has posted warning signs at water bodies which historically have had blooms. Recreational

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Public Hearing: Surface Water Quality Standards Triennial Review

The Division of Watershed Stewardship will conduct a public hearing on Wednesday, April 20, 2022, to consider comments from the public on proposed revisions to Delaware’s Surface Water Quality Standards.

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Delaware’s Section 303(d) Waters and Data Solicitation

The state has released a draft of its 2022 Combined Watershed Assessment Report for comments on DNREC’s tentative determination for Delaware’s 2022 Section 303(d) List.

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Local Government Guide to the Chesapeake Bay

The Local Government Guide to the Chesapeake Bay is a seven-module series created to support decision-making by local officials. A Local Government Guide to the Chesapeake Bay, a video introduction from the Chesapeake Bay Program.

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Public Notice of Triennial Review of Water Quality Standards

The Department of Natural Resources and Environmental Control has begun a Triennial Review of Delaware’s Surface Water Quality Standards.

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Success Stories: Tappahanna Ditch

Runoff from agricultural areas caused high bacteria levels in Delaware’s Tappahanna Ditch of the Choptank River. As a result, the Delaware Department of Natural Resources and Environmental Control (DNREC) added the watershed to the 1996 Clean Water Act (CWA) section 303(d) list of impaired waters for bacteria and nutrients. Watershed stakeholders provided technical assistance and

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Success Stories: Iron Branch

Runoff from agricultural areas caused high bacteria levels in Delaware’s Iron Branch of Indian River Bay. As a result, the Delaware Department of Natural Resources and Environmental Control (DNREC) added the watershed to the 1996 Clean Water Act (CWA) section 303(d) list of impaired waters for bacteria. Watershed stakeholders provided technical assistance and installed agricultural

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Wetlands and Subaqueous Lands Permits

A list of applications to the DNREC Wetlands and Subaqueous Lands Section for permits, leases and water quality certifications.

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Conservation Reserve Enhancement Program

DNREC is part of a state and federal partnership with the USDA Commodity Credit Corporation, that aims to add up to 10,000 acres of Delaware agricultural land to the USDA Conservation Reserve Enhancement Program (CREP). Landowners in the CREP receive funding to support land conservation practices.

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Chesapeake Bay Projects

This page includes information on some of the projects undertaken by DNREC and its partners to help meet the goals of the Chesapeake Bay Watershed Implementation Plan.

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Chesapeake Bay Watershed Implementation Plan – Phase III

There have been three phases of Delaware’s Chesapeake Bay WIP. Delaware developed its Phase I WIP in 2010 and its Phase II WIP in 2012. Both the Phase I and Phase II WIPs describe actions and controls to be implemented by 2017 and 2025 to achieve applicable water quality standards. The Phase III WIP provides

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Chesapeake Bay Watershed Implementation Plan – Phase I

Draft Phase I Watershed Implementation Plans (WIPs) were due to EPA on Sept. 1, 2010. Final plans were submitted on Nov. 29, 2010. Following the release of Delaware’s Draft Phase I WIP, numerous comments and questions from both EPA and various stakeholder groups within the watershed were submitted.

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Chesapeake Bay Watershed Implementation Plan – Phase II

Delaware’s Draft Phase II Watershed Implementation Plan for the Chesapeake Watershed was submitted to the EPA on Dec. 15, 2011. EPA reviewed the document and provided comments in Feb. 2012. Public comments were accepted through March 21, 2012. All suggestions were considered and the document was modified accordingly.

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Events and Workshops

The DNREC Nonpoint Source Program has hosted and participated in a series of events, workshops, and presentations designed to promote and support improvements to the quality of Delaware’s waterways. Delaware Agriculture Week (January 8-11, 2024) Delaware Agriculture Week, held at the Delaware State Fairgrounds in Harrington, is

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Chesapeake Bay Milestones

To continue accelerating progress toward meeting water quality goals, the EPA and Chesapeake Bay Program jurisdictions, including Delaware, agreed to set interim two-year milestones – or short-term goals – as a critical part of an accountability framework. ChesapeakeStat Find data and information

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Chesapeake Bay Watershed Implementation Plan

Delaware is among six Chesapeake Bay Watershed states – along with Maryland, Virginia, West Virginia, Pennsylvania, and New York – and the District of Columbia committed to a federal-state initiative to develop a pollution “diet” that will help restore the water quality of the Bay and its tidal waters by 2025. [column

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Verification of Best Management Practices

The implementation, tracking and reporting of Best Management Practices (BMPs) has been at the center of the Chesapeake Bay Program partnership’s restoration efforts for almost three decades. Properly installed and functioning practices and technologies reduce local flooding, protect sources of drinking water, ensure against the collapse of stream

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Watershed Plans and Strategies

Numerous documents describing plans or strategies for water quality and watershed improvements have been developed over the years. Some of these efforts originated through the Tributary Action Team process while others came through other initiatives. All of the documents below can be considered watershed management plans for the Water Quality Improvement Projects grant program

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Pollution Control Strategies and Tributary Action Teams

A 1997 federal court case required Delaware to set pollution limits for its waterways. These limits are called Total Maximum Daily Loads or TMDLs, a term you will hear a lot in water pollution discussions. In order to meet these new pollution limits, we are identifying ways to reduce water pollution. Usually, citizens don’t get

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Integrated Report: 305(b) Report and 303(d) List

Section 305(b) of the Federal Clean Water Act requires that states and other entities prepare and submit Watershed Assessment Reports to the US EPA on April 1 of every even-numbered year.

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You Can Help Protect Delaware’s Waterways

There are always things that you can do in your everyday life, no matter where you live, to help protect the waterways that serve as our drinking water sources, habitat for wildlife, and places of recreation. Maintain a Healthy Lawn and Garden A healthy lawn and garden makes a

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Watershed Assessment and Management

The Watershed Assessment and Management Section oversees the health of the state’s surface water resources and takes actions to protect and improve water quality for aquatic life and human use.

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Whole Basin Management

Beginning in the 1990s, the Department of Natural Resources and Environmental Control (DNREC) took a different approach to assessing, managing, and protecting Delaware’s natural resources. This approach, known as Whole Basin Management, encouraged the various programs throughout DNREC to work in an integrated manner to assess different geographic areas of the state defined on the

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Protecting Our Waterways

There are many things each of us can do to help reduce nutrient and sediment pollution entering Delaware’s waterways. Our efforts will not only help protect the environment, but in many cases, when you lend a hand to protect our waterways, you will also find that you’re adding beauty to your yard,

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Water Quality Monitoring

Delaware’s bays, ponds, streams, and rivers are monitored on a regular basis to assess the quality of Delaware’s surface waters. Much of the monitoring is done by DNREC, though other groups, including federal agencies, academic institutions, and citizen volunteer monitoring programs, also contribute to these efforts.

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Inland Bays Pollution Control Strategy

The Inland Bays Pollution Control Strategy (PCS) and accompanying regulations were finalized in Nov. 2008. This strategy is designed to improve the water quality of the bays (Rehoboth Bay, Indian River Bay, and Little Assawoman Bay), as well as the rivers, streams, and ponds that drain to the bays. ADVISORY: A

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Surface Water Quality Standards

The National Clean Water Act of 1972 set in place a program that is intended to restore the chemical, physical, and biological integrity of the nation’s waters. To reach these goals, a series of steps were mandated by Congress for the Environmental Protection Agency and the individual States to take. The first step was for

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Promoting Shellfish Safety

To ensure the safety of Delaware’s shellfish growing areas, it is important that residents and visitors help maintain good water quality and limit pollution while recreating in or near shellfish growing areas.

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Shellfish Plant Inspections

Plant inspections of all shellfish shippers and processors are conducted routinely by certified Shellfish Program staff to ensure compliance with national food safety regulations and those specific to the shellfish industry. Andrew Bell Environmental Scientist 302-739-9939

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Delaware Shellfish Program

The DNREC Shellfish Program is responsible for protecting public health by minimizing the risk of food borne illness due to the consumption of shellfish. Growing Waters and Plant Inspections Andrew Bell Environmental Scientist 302-739-9939 Enforcement Natural Resources Police 302-739-9913

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Eco-Explorers Virtual Field Trip Registration

This form is for teachers and homeschool groups to register for an Eco-Explorers virtual field trip with the Aquatic Resources Education Center. There is no charge for the field trip but please register if you plan to use the virtual field trip material. This will help us provide additional programs in the future.

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Virtual Eco-Explorers Field Trip Program

The Aquatic Resources Education Center offers a virtual version of the Eco-Explorers field trip program. The resources of the virtual field trip are useful for students or school groups unable to attend traditional, in-person field trips and as supplementary and review material for in-person field trip participants.

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Success Stories: Pike Creek

Pike Creek is in northern New Castle County and is a tributary of White Clay Creek within the White Clay Creek subbasin. The lower portions of the White Clay Creek are tidally influenced. In 2000, the President signed a law adding 190 miles of the White Clay Creek and its tributaries to the National Wild

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Biennial NPS Training and Meeting

The DNREC Nonpoint Source Program (NPS), in partnership with Environmental Protection Agency (EPA) Region 3, hosted the 2019 Mid-Atlantic Nonpoint Source Program Training and Meeting in October of 2019. The states in the EPA Region 3 (Delaware, Maryland, Virginia, Pennsylvania, and West Virginia) take turns hosting this biennial event. The next meeting,

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Success Stories: Trap Pond

Southern Delaware’s Trap Pond is a tributary of Broad Creek, which drains to the Nanticoke River and flows to the Chesapeake Bay. This area has a unique ecology, as it is home to the northernmost natural stand of bald cypress in the United States. The area also contains a 2,000-acre wetland, one of the largest

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Success Stories: Gravelly Branch

Southern Delaware’s Gravelly Branch watershed drains into the Nanticoke River, which flows into the Chesapeake Bay. Gravelly Branch begins in the town of Ellendale and flows toward the city of Seaford. The major land use in the 24,423-acre Gravelly Branch watershed is agriculture.

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Success Stories: Upper Marshyhope Creek

The Delaware portion of the Marshyhope Creek watershed (Upper Marshyhope Creek) lies within Kent and Sussex counties on the western edge of Delaware. The creek flows into Maryland before eventually discharging into the Nanticoke River, which in turn empties into the Chesapeake Bay. The drainage area of the Marshyhope Creek watershed within Delaware is approximately

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Success Stories: Cow Bridge Branch

Stockley Branch flows into Cow Bridge Branch watershed, which spans 28,676 acres and is located in the Indian River watershed in southeastern Sussex County. The Indian River Bay watershed makes up one of three of Delaware’s interconnected Inland Bays (Rehoboth Bay, Indian River Bay, and Little Assawoman Bay). [button

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Success Stories: Little Assawoman Bay

Little Assawoman Bay — the smallest of Delaware’s Inland Bays — is connected to Indian River Bay on the north by the Assawoman Canal and to Assawoman Bay on the south via a narrow channel. The Little Assawoman Bay watershed is an agriculture-dominated watershed covering three square miles with no influencing point sources. The area

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Success Stories: Noxontown Pond

Noxontown Pond covers approximately 158 acres near the headwaters of the Appoquinimink River watershed. This watershed contains three of the fastest developing municipalities in the state – Odessa, Townsend, and Middletown. While much of this watershed was historically agricultural, increased development has led to the conversion of farms into suburban residential communities. Less than 9%

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