Conservation Easements: Protecting Land and Water Quality
Conservation easements are voluntary legal agreements in which a landowner limits the type or amount of development on a property to protect its natural, agricultural, or scenic values. The easement can cover all or a portion of a parcel and can either be permanent (held in perpetuity) or last for a specified number of years. This legal tool ensures that the land is preserved in its designated state long after the original owners no longer control the property.
By restricting or giving up development rights, a landowner can often receive significant state and federal tax benefits. In addition, easements can relieve property owners of the management burden for sensitive areas by shifting responsibility to a qualified private land trust or government agency. This third-party organization, known as the easement holder, is equipped to handle the long-term monitoring and enforcement required to uphold the terms of the agreement.
How a Conservation Easement Works
An easement is typically described by the resource it is designed to protect, such as an agricultural, forest, historic, or open space easement. The legal document explains and mandates the restrictions on the uses of the property. The primary mechanism by which conservation easements contribute to water quality protection is by restricting future development, thereby limiting the creation of new impervious surfaces like roads, rooftops, and parking lots.
Conservation easements are most commonly used to preserve agricultural lands and natural areas on the suburban-rural fringe that are facing development pressure. In rapidly urbanizing areas, they can be a practical way to preserve open space before land prices make outright purchase impractical for public agencies or conservation groups. However, easements are rarely used in ultra-urban settings due to the general lack of available open space and the extremely high cost of undeveloped land.
Will a Land Trust Accept the Property?
Private land trusts use several criteria to determine if a property is suitable for management under a conservation easement. The following table outlines typical questions a land trust might ask when evaluating a potential easement donation.
| Criterion | Question the Land Trust Asks |
|---|---|
| Natural resource value | Does the property provide critical habitat or important environmental features worth preserving? |
| Uniqueness | Does the property have unique traits worth preserving? |
| Size | Is the land large enough to have natural resource or conservation value? |
| Financial considerations | Are funds available to meet all financial obligations? |
| Perpetuity | Is the conservation agreement perpetual? |
| Land trust mission | Does the property align with the trust’s mission and organization-specific criteria? |
Easement Holder Responsibilities
Once an easement is established, the holding organization—whether a government agency or a private land trust—assumes several key management duties to uphold the agreement. These responsibilities ensure the conservation values of the property are protected over the long term as stipulated in the easement document.
Key responsibilities of the easement holder include:
| Management Duties of an Easement Holding Organization |
|---|
| Ensure that the language of the easement is clear and enforceable. |
| Develop maps, descriptions, and baseline documentation of the property’s characteristics. |
| Monitor the use of the land on a regular basis. |
| Provide information regarding the easement to new or prospective property owners. |
| Establish a review and approval process for land activities stipulated in the easement. |
| Enforce the restrictions of the easement through the legal system if necessary. |
| Maintain property and easement-related records. |
A detailed baseline documentation report, with maps and photographs, is critical. Without it, proving a violation years or decades later becomes nearly impossible for the easement holder.
What Open Space Costs to Maintain
A significant benefit of conserving land in its natural state is the low cost of long-term maintenance compared to developed or landscaped areas. The following data, adapted from the Center for Watershed Protection (1998), summarizes the approximate annual costs of maintaining different types of open space.
| Land Use | Approximate Annual Maintenance Cost | Source |
|---|---|---|
| Natural open space (minimum maintenance, trash/debris cleanup) | $75 per acre per year | NPS, 1995 |
| Lawns (regular mowing) | $240-270 per acre per year | Wildlife Habitat Council, 1992 |
| Passive recreation | $200 per acre per year | NPS, 1995 |
As the data indicates, keeping easement land in a natural vegetative state is the most cost-effective management strategy. Costs rise significantly with uses that require regular mowing, landscaping, or maintenance of recreational facilities.
Stormwater Benefits: Keeping Land Pervious
The primary stormwater benefit of a conservation easement is the preservation of pervious land cover. By preventing future development, an easement ensures that the impervious fraction of a site remains close to zero. This directly impacts runoff generation, a relationship quantified by the Simple Method for calculating urban runoff, where the runoff coefficient (Rv) is a direct function of impervious area (Ia).
When easement land is located along streams or other water bodies, it can serve the dual purpose of a protected riparian buffer zone, providing additional water quality benefits through filtration, bank stabilization, and habitat preservation. Every acre of land preserved in its natural state is an acre that does not contribute to downstream runoff volume and pollutant loads.
It is important to acknowledge that there is no direct scientific evidence conclusively linking the administrative act of creating a conservation easement to specific water quality improvements. The case for their benefit rests on the foundational principle of restricting future impervious cover. In some cases, outright ownership of land by a conservation organization may offer more comprehensive protection than an easement, which still allows for certain activities on the property.
A State Program Example: Maryland
Many states use land purchase and easement programs to protect significant environmental features. Maryland has been nationally recognized for its programs that provide funding for state and local parks and conservation areas, financed primarily through a real estate transfer tax. This tax of one-half of one percent ($5 per $1,000) of the purchase price of property funds several key initiatives.
These initiatives include:
- Program Open Space, which is responsible for acquiring approximately 150,000 acres of open space for state parks and natural resource areas, as well as more than 25,000 acres of local park land. To receive their portion of the 50% of funds granted to local governments, counties must create a Land Preservation and Recreation Plan that outlines acquisition and development goals.
- The Maryland Environmental Trust, a state-funded agency that helps citizen groups form and operate local land trusts. It offers technical assistance, training, grants for land protection projects and administrative expenses, and facilitates the Maryland Land Trust Alliance.
- The Rural Legacy program, which redirects state funds into a focused land preservation program designed to limit the impacts of sprawl. The program purchases conservation easements for large, contiguous tracts of agricultural, forest, and natural areas subject to development pressure.
Implementation Barriers and Local Code Notes
While effective, conservation easements have limitations as a stormwater management tool. They are often not a viable option in highly urbanized areas where the size, quality, and cost of available land are prohibitive. Easements that are not held in perpetuity may only delay, rather than prevent, future development pressure. Furthermore, easements do not by themselves treat or filter pollutants from concentrated stormwater flows that may cross the property.
Both state agencies and private land trusts have specific qualification criteria for properties they will accept, and they may limit the size and type of land they are willing to manage. For landowners, the decision between donating an easement and making an outright donation of the land is a key consideration. Outright ownership by a conservation group may offer stronger protection, but an easement allows the original owner to retain title and use of the property. Conservation easements are one of several site design tools and can be used in concert with broader land use strategies like watershed-based zoning.
Frequently Asked Questions
What is a conservation easement?
A conservation easement is a voluntary, legally binding agreement between a landowner and a qualified organization, such as a land trust or government agency. The agreement permanently limits certain uses of the land to protect its conservation values, such as water quality, wildlife habitat, scenic views, or agricultural productivity. The landowner continues to own and use the land and can sell it or pass it on to heirs, but the future use of the property is subject to the terms of the easement, which runs with the land.
Is a conservation easement permanent?
Conservation easements can be either permanent (perpetual) or for a specified term. However, to qualify for federal and many state tax benefits, the easement must be granted in perpetuity. Perpetual easements provide the strongest and most lasting protection for the land’s conservation values, as the restrictions remain in place regardless of who owns the property in the future. Term easements offer temporary protection but do not prevent development pressure from returning once the term expires.
What are the tax benefits of a conservation easement?
Donating a perpetual conservation easement to a qualified organization can result in significant tax benefits, although specifics depend on current tax law. A landowner may be eligible for a federal income tax deduction for the value of the donated easement. This value is determined by a qualified appraiser as the difference between the land’s fair market value before and after the easement is in place. There may also be state income tax credits and potential reductions in estate and property taxes. Landowners should always consult with a qualified tax advisor and legal counsel to understand the financial implications.
Can the owner still use the land?
Yes. The landowner retains title to the property and can continue to use it for purposes that are consistent with the terms of the easement. For example, an easement on a farm would typically allow for continued agricultural activities, while an easement on a forested property might permit sustainable timber harvesting or recreation. The agreement specifically defines the rights reserved by the landowner as well as the prohibited activities, such as subdivision or commercial development. The goal is to allow for private use and enjoyment while preventing activities that would damage the land’s conservation values.
Who enforces a conservation easement?
The easement is enforced by the organization that holds it, known as the easement holder or grantee. This is typically a nonprofit land trust or a government agency. The holder has a legal responsibility to monitor the property, usually on an annual basis, to ensure the landowner is complying with the terms of the agreement. If a violation occurs, the holder is obligated to take action to correct it, which may include legal proceedings if necessary. This stewardship ensures the conservation promises of the easement are kept over time.
What does it cost to maintain easement land?
Maintenance costs depend entirely on the land use permitted by the easement. If the land is kept in its natural state as a forest or meadow, annual maintenance costs can be very low, often less than $100 per acre per year, primarily for tasks like trash cleanup (NPS, 1995). In contrast, maintaining the land as a regularly mowed lawn can cost over $250 per acre annually (Wildlife Habitat Council, 1992). For this reason, preserving natural cover is not only beneficial for water quality and habitat but is also the most cost-effective long-term management approach for open space.
Do easements protect streams?
Conservation easements provide indirect but significant protection for streams and water quality. By preventing development, they limit the creation of new impervious surfaces, which reduces the volume and velocity of stormwater runoff entering local waterways. When an easement protects land adjacent to a stream, it functions as a permanent riparian buffer, which helps filter pollutants, stabilize stream banks, and provide critical aquatic and terrestrial habitat. While an easement itself doesn’t treat stormwater, it preserves the natural landscape’s capacity to manage rainfall and protect water resources.
How does an easement compare to selling the land outright?
Selling or donating land to a conservation organization provides the highest level of protection, as the organization takes full ownership and management responsibility. However, the landowner relinquishes all rights to the property. A conservation easement offers a more flexible alternative. It allows the landowner to retain ownership, live on the land, and pass it to heirs, all while ensuring its conservation values are protected permanently. This makes it an appealing option for landowners who want to protect their land but are not prepared to sell it or give it away entirely.