Appellants Michael and Amy Tucci sued the District of Columbia for “Maintenance of a Public Nuisance” and “Refusal to Enforce Municipal Regulations and Other Laws.” They now appeal an order of the Superior Court which granted summary judgment in favor of the District of Columbia. We affirm.
I. The Factual Background
Michael and Amy Tucci have lived at 3060 Grant Road, N.W., in the District of *688 Columbia since August 2002. Their home faces Grant Road, but all of the neighboring houses abutting Grant Road face adjacent streets. Thus, they own the only house with an address on the 3000 to 3200 blocks of Grant Road.
The Tuccis complain that the neighbors “take their refuse and open the gate to the backs of their property, walk on to the public space [on Grant Road] and dump their refuse.” Even though trash is regularly collected, their neighbors leave trash cans in the public space all week long instead of only during times designated for trash collection. They allege that “structures” and compost bins have been erected on the public right-of-way. Rats and other vermin have been seen along Grant Road, and the Tuccis have “rat tunnels” in their yard. The Tuccis do not allege that any trash or other items have encroached upon their private property, and they do not contend that the District has left its own trash or other items in the public space.
They do claim that Grant Road is “overgrown with vegetation to such an extent that it is impossible to travel the road without damage to vehicles from the overgrowth.” The overgrown vegetation has scratched the Tuccis’ vehicles on either side. Moreover, the roadbed is in disrepair due mainly to erosion caused by the lack of gutters. “As a result, debris, silt and vegetation are deposited along the street and large gulleys have formed on either side of the pavement due to lack of adequate drainage.” They have had “at least ten flat tires,” resulting in “hundreds ... if not thousands of dollars” in replacement tires. In sum, the Tuccis assert that Grant Road looks more like an alley than a street.
Appellants have made numerous complaints to the Department of Public Works (“DPW”) about the conditions on Grant Road. DPW has responded by issuing citations and fining neighbors for placing trash containers out on the wrong day or at the wrong time and for allowing vegetation to intrude on public space. DPW has assured the Tuccis that its enforcement efforts will continue. In the Tuccis’ view, however, “the District’s decisions regarding enforcement [have been] clouded by a misunderstanding of the facts.” They assert that the District has not enforced the regulations “to the extent required by law.”
At least part of the Tuccis’ dissatisfaction with the District’s enforcement efforts derives from a fundamental disagreement about where their neighbors’ private property ends and the public space begins. The Tuccis assert “that Grant Road is a bona fide district street and that the right-of-way is thirty-three feet wide.” Utility poles are located within that space, however, and the paved roadbed is approximately sixteen feet wide. In memoranda to Mr. Tucci, DPW has referred to the “telephone and light posts [as] designating] where the public space beginfs] in the alley[;] the area between the posts should show the correct width of the alley (public space).” 1
*689 The Tuccis assert that they have suffered substantial and unreasonable interference with the use and enjoyment of their private property. They can no longer entertain guests as they please, and the value of their property is diminished, although they concede it is worth more than the price they paid.
II. The Procedural Background
The Tuccis filed a two-count complaint accusing the District of Columbia of “Maintenance of a Public Nuisance” and “Refusal to Enforce Municipal Regulations and Other Laws.” They prayed “for all damages incurred as a result of the [District’s] maintenance of a public nuisance on the Grant Road right-of-way in an amount to be proven at trial, but in no event less than the difference in the market value of [the Tuccis’] property situated adjacent to a public nuisance as opposed to a properly maintained city street....” They also sought an injunction requiring the District to “enforce the municipal regulations and other laws with respect to the Grant Road right-of-way....”
Both parties moved for summary judgment. With respect to the nuisance claim, the trial court distinguished
District of Columbia v. Fowler,
Even if the Tuccis had claimed the District was negligent, the city government “is immune from suit under the doctrine of sovereign immunity.... [W]hether to prosecute or to enforce a regulation is a discretionary, as opposed to ministerial decision, involving many policy considerations for which the municipality is immune.” The trial court also noted that under the public duty doctrine the District “has no duty to enforce the public space and solid waste regulations let alone a special duty to enforce them at plaintiffs’ direction or for plaintiffs’ benefit.” Similarly, “the District’s decisions as to which streets to repave or where to add curbs are clearly discretionary decisions for which the city is immune.” Moreover, “there is no private right of action in the ‘Litter Control Administration Act[,]’ which makes the issuance of tickets for violation of the act discretionary.” For these reasons, the court denied the motion filed by the Tuccis and granted summary judgment in favor of the District.
III. Standard of Review
“In reviewing a trial court’s grant of summary judgment, we make an independent review of the record and employ the same standards as does the trial court in initially considering the motion.”
EastBanc, Inc. v. Georgetown Park Associates II, L.P.,
IV. The Request for Injunctive Relief
The Tuccis ask only for injunctive relief with respect to their claim under the Litter Control Administration Act (“LCA”). In a case where the plaintiffs similarly sought only an injunction, we held that “[t]he actions of government agencies are normally presumed to be subject to judicial review....”
District of Columbia v. Sierra Club,
In
Sierra Club,
we acknowledged that “[t]he determination whether and when to institute enforcement proceedings against a specific individual is a core executive responsibility which may reasonably be viewed as having been committed to agency discretion so as to preclude substantive judicial review.”
The Tucéis resist this conclusion, arguing that enforcement of the LCA is not discretionary. In their view, “[t]he D.C. City Council mandated that the Mayor ... enforce the Act and used the word ‘shall.’ ” See D.C.Code § 8-802 (2008 Supp.) (“The Mayor of the District of Columbia ... shall enforce the District of Columbia Solid Waste Management and Multi-Material Recycling Act of 1988.... ”). But this type of language is no different in kind from that found in many provisions of criminal law. See, e.g., D.C.Code § 1-1001.08(b)(4) (2001) (prosecution of unauthorized circulators of petitions; “Violations of this section shall be prosecuted in the name of the District of Columbia by the Corporation Counsel of the District of Columbia.”); D.C.Code § 3-608(a) (2001) (prosecution of any person who holds, engages, or participates in unlicensed boxing, wrestling, or martial arts exhibitions; “Such cases shall be prosecuted by the Corporation Counsel of the District of Columbia in the Superior Court of the District of Columbia.”); D.C.Code § 10-503.18(c) (2001) (unlawful conduct on Capitol grounds; ‘Violations of this part ... shall be prosecuted by the United States Attorney or his assistants in the name of the United States.”). No one would seriously argue that the use of the term “shall be prosecuted” in these statutes requires the Attorney General for the District of Columbia (formerly the Corporation Counsel) or the United States Attorney to prosecute each and every violation of these statutes brought to his or her attention. Similarly here, the words “the Mayor ... shall enforce” allocate responsibility — they do not strip the Mayor of discretion in undertaking enforcement action.
Alternatively, the Tucéis characterize the District’s actions as “ministerial” because “[t]he agency decided to undertake enforcement action and has proceeded, albeit incorrectly.” According to appellants, the District had already exercised its discretion in favor of enforcement. From that point on, they assert, the District’s actions were merely ministerial: “Once it was determined that a citation should issue, it must issue in accordance with the regulatory requirements.... ” We previously have rejected a similar attempt to blur the distinction between discretionary and ministerial functions by “isolating each component of a decision.... ”
Aguehounde v. District of Columbia,
*692
This iteration of the Tucéis’ argument is simply a complaint about the
level
or
extent
of enforcement activity undertaken by the District. They contend that the District should expand its field of operations to include all portions of the public right-of-way, as shown on their survey. But these are decisions about “whether and when to institute enforcement proceedings against a specific individual,”
Sierra Club,
We similarly are unpersuaded by the Tucéis’ reliance upon three decisions of the United States Court of Appeals for the District of Columbia Circuit which supposedly demonstrate that DPW’s enforcement decisions are subject to judicial review.
5
In each of these cases, the court construed and applied
Heckler v. Chaney,
In
New York State Department of Law v. Federal Communications Commission,
the court observed that, “in some circumstances, an otherwise nonreviewable decision about initiating an enforcement action becomes reviewable once the agency undertakes the action.” 299 U.S.App. D.C. 371, 376,
The court’s decision in
New York State Department of Law
actually supports the conclusion that the District’s enforcement decisions are not reviewable. The court
held
“that the FCC’s decisions about the initial scope of the enforcement action and its decision to enter into the Consent Decree are committed to the agency’s non-reviewable discretion_” 299 U.S.App. D.C. at 373,
In
Robbins v. Reagan,
250 U.S.App. D.C. 375,
For all these reasons, the Tuccis were not entitled to an injunction, and the Superior Court properly granted summary judgment on this count of their complaint.
V. Sovereign Immunity and the § 12-309 Notice
Before we discuss the Tuccis’ claim for damages, we reject an argument they raise in passing. It is undisputed that the Tuc-cis complied with D.C.Code § 12-309 (2001) by giving the District timely notice of the circumstances about which their lawsuit complains. They mistakenly assert, however, that because they “filed a tort claim against the District in accordance with [§ 12-309,] there is no basis to claim that the District is immune from [their] tort claims herein.” This argument reflects a misunderstanding of the nature and purpose of § 12-309.
Section 12-309 provides that “[a]n action may not be maintained against the District of Columbia for unliquidated damages to person or property unless, within six months after the injury or damage was sustained, the claimant, his agent, or attorney has given notice in writing to the Mayor of the District of Columbia of the approximate time, place, cause, and circumstances of the injury or damage.... ” *694 As we will explain at more length below, nothing in the plain language of the statute purports to waive sovereign immunity if the required notice has been given.
Congress enacted what is now § 12-309 in 1933,
7
at least partially in response to the decision in
District of Columbia v. Leys,
“[Compliance with the statutory notice requirement is mandatory,”
Pitts v. District of Columbia,
Nevertheless, some of our language, often repeated, may be misconstrued to suggest that compliance with § 12-309 defeats a claim of sovereign immunity.
See, e.g., Snowder v. District of Columbia,
Nothing in the plain language of the statute suggests that compliance with its requirements precludes a defense of sovereign immunity. A waiver of sovereign immunity must be “unequivocally expressed in statutory text.”
Lane v. Pena,
As our previous decisions have indicated, however, there is an undeniable connection between a statute like D.C.Code § 12-309 and the doctrine of sovereign immunity. “Notice of claim statutes ... are terms and conditions imposed by the government on the government’s waiver of its immunity.”
Findley v. City of Kansas City,
VI. The Claim for Damages
The Tuccis alleged in their complaint that the “condition of the Grant Road right-of-way constitutes a substantial and unreasonable interference with the ... use and enjoyment of their property” and therefore is “a public nuisance.” On appeal, however, they concede that the label “public nuisance” was “imprecise” and argue that their claim was, “in reality,” a claim of private nuisance; indeed, they assert that they actually “ple[]d the elements of a private nuisance.” Thus, we concentrate our analysis on the nature of a private nuisance. 10
“[A] ‘private nuisance’ is a substantial and unreasonable interference with private use and enjoyment of one’s land ... for example, by interfering with the physical condition of the land, disturbing the comfort of its occupants, or threatening future injury or disturbance.”
B & W Management, Inc. v. Tasea Investment Co.,
Nuisance law is a “ ‘a field of tort liability, rather than a type of tortious conduct.... Nuisance, in short, is not a
*697
separate tort in itself, subject to rules of its own.”
District of Columbia v. Fowler,
We therefore must look past the label “nuisance” to determine whether the neglect which the Tuccis allege provides a basis for finding the District liable for tortious conduct. As with their claim for injunctive relief, the Tuccis complain that the District failed to discharge its duty to enforce the LCA and the implementing regulations. 13 They also assert that the District has not properly maintained the roadway. As the trial court recognized, however, the District is protected by the doctrine of sovereign immunity.
Our cases describing the scope of sovereign immunity distinguish between discretionary acts and ministerial acts: “It is now settled that a District officer, and the District when sued for the acts of an officer under the theory of
respondeat superior,
are protected by sovereign immunity if the officer’s acts are discretionary, but subject to liability if the acts were ministerial in character.”
Powell v. District of Columbia,
In addition to faulting the District for failure to enforce the litter regulations, the Tuccis complain about the condition of the roadway. They “would like the city to install curbs and gutters and pave the road consistent with the requirements that it enforces [upon] their contractors on other adjacent city streets.” They concede, however, that the roadbed has been repaved since they moved into their home. Whether to install curbs and gutters is a discretionary decision for which the District is entitled to immunity.
Pace,
The Tuccis also complain about the District’s “failure to maintain” Grant Road, “the rat and other vermin infestation,”
14
and the overgrowth of vegetation
15
along the road. “[T]he District does have a ministerial duty to maintain its streets and highways.”
Pace,
Before the District may be liable for failure to maintain a roadway, it must have notice (actual or constructive) of an unsafe or dangerous condition.
Rajabi v. Potomac Electric Power Co.,
The Tuccis aver that the “abhorrent” condition of the road has caused damage to their personal property. They complain that they have had “at least ten flat tires” since they moved to Grant Road, and have “replaced hundreds ... if not thousands of dollars worth of tires,” and have had their cars “aligned much more often than you would expect based on normal wear and tear.”
Damages of this type are not enough, by themselves, to show an “unreasonably dangerous” condition or negligence on the part of the District.
Cf. Williams v. District of Columbia,
Given the relatively minor nature of the damage, and the complexity of the inquiry, this is the type of case where “[t]he standard of care must be established through expert testimony....”
Rajabi,
For these reasons, the judgment of the Superior Court is hereby
Affirmed.
Notes
. The trial court noted:
The Court understands that initially the District may have been under the impression that the properly in question was private property. Plaintiffs have tendered a survey prepared at their expense that allegedly shows that the area in question is within the right of way. Although the District asks the Court not to consider the survey and affidavit of plaintiffs’ expert, because they were produced late and defendant has not had an opportunity to respond to the survey, for purposes of these motions, the Court accepts plaintiffs’ proffer that the trash, debris and structures have been placed on a bona fide public street as opposed to private property.
*689 We likewise assume, for the purposes of this decision, that the disputed area is part of the public right-of-way. We offer no opinion on whether the Tuccis have properly established that fact.
. The Tuccis incorrectly suggest that the standard of review requires that their "well ple[]d allegations [be] taken as true.” However, the District moved for summary judgment, meaning that the Tuccis could not rely on the allegations in their pleadings; they were required to proffer evidence to support each element of their claims. See
Kibunja v. Alturas, L.L.C.,
. The District invites us to apply the analysis in
Cort
v.
Ash,
. In
Dalehite,
the Supreme Court decided whether the Federal Tort Claims Act waived sovereign immunity for the government's manufacturing and transporting of fertilizer. Holding that the Act did not waive immunity for discretionary functions, the Court noted that a " ‘discretionary function or duty’ ... includes more than the initiation of programs
*692
and activities. It also includes determinations made by executives or administrators in establishing plans, specifications or schedules of operations. Where there is room for policy judgment and decision there is discretion.”
. In addition to being readily distinguishable, these decisions, decided after February 1, 1971, are not binding upon us.
See M.A.P. v. Ryan,
. We reject the Tuccis’ argument that we may exercise judicial review in this case because the District misunderstood “the location of the public/private property line” and its "decisions regarding enforcement [thus] were clouded by a misunderstanding of the facts.”
See Baltimore Gas & Electric Co. v. Federal Energy Regulatory Comm’n,
346 U.S.App. D.C. 265, 268-69,
. See Pub.L. No. 72-385, 47 Stat. 1370 (1933).
. The purposes of the statute are: “(1) to allow the District to investigate potential claims so that evidence may be gathered while still available, for example before the relevant sidewalk is paved over or the meter cover fixed, (2) to enable the District to correct defective conditions, thus increasing public safety, and (3) to facilitate settlement of meritorious claims and resistance of frivolous ones.”
Hardy v. District of Columbia,
.Gwinn
goes on to explain that "[t]he doctrine of sovereign immunity, though limited, is still viable in the District of Columbia.... The District is immune from suit when the act complained of was committed in the exercise of a discretionary function.”
. The parties agree that, given the facts of this case, it makes little difference whether we treat the Tuccis’ complaint about interference with their use of private property as alleging a public or private nuisance.
See, e.g., B & W Management, Inc.,
. " ‘A public nuisance is an unreasonable interference with a right common to the general public.' ”
B & W Management, Inc.,
. The Tuccis suggest for the first time in their reply brief that the District intentionally interfered with the use and enjoyment of their land and that a remand for further proceedings on this alternative theory is appropriate. We reject this attempt to amend the complaint on appeal and decline to remand the case.
See Gillespie
v.
Washington,
. The complaint does not allege either a nuisance
per se
or intentional or reckless conduct by the District. The Tuccis concede that they never alleged an intentional tort, but their appellate brief asserts that the “violations of municipal regulations regarding sanitation, solid waste and refuse” of which they complain "are violations of ... enumerated regulations, specifically 24 DCMR § 1000,” and thus "can fairly be characterized as per se nuisances.” Even if we were to consider this nuisance
per se
claim to be properly raised,
but see Gillespie,
The violations of which the Tuccis complain allegedly were committed by their neighbors, but they seek in this litigation to hold the District liable in damages. Thus, the viability of this claim depends on whether the doctrine of sovereign immunity applies. Moreover, we have defined a nuisance
per se
as "a structure or activity which is a nuisance at all times and under any circumstances.”
Harris v. United States,
. Michael Tucci testified in his deposition that the "vermin” and other animals include rats, voles, opossums, raccoon, deer, mice, and foxes. The Tuccis acknowledge that their house is near Rock Creek Park, however, and the District of Columbia does not have a general duty to keep the fauna of that federal parkland from exploring their neighborhood. "Rock Creek Park is a prized part of the District precisely because of its uniqueness in being natural woodland situated in the midst of an urban area [but it is not] isolated from the urban area surrounding it.”
See Husovsky v. United States,
191 U.S.App. D.C. 242, 248-49,
Moreover, the presence of these animals, by itself, does not amount to a "nuisance ... in the legal sense.”
Bernstein v. Fernandez,
. The Tuccis concede that their "neighbors are responsible for maintaining [the vegetation] pursuant to city regulations,” meaning that the District could issue citations for violations of the regulations. Thus this portion of their complaint is properly treated under the law enforcement analysis discussed above, and their claim is barred by sovereign immunity.
. It was the seclusion of their house that initially attracted the Tuccis. According to Amy Tucci, the "very minimal traffic” on Grant Road is "actually one of the things that was so appealing about the house.” "The road actually gets more pedestrian traffic than it does vehicular traffic,” and the Tuccis are "really the only people that need to use Grant Road as an entrance and exit.”
