Sacramento County Sheriffs Deputy Ronald Mortensen appeals the district court’s grant of summary judgment in favor of his employer. The question for decision is whether the Fair Labor Standards Act (“FLSA”), 29 U.S.C. § 207(o), requires the county to allow its deputies to use accrued compensatory time off (“CTO”) on days they specifically request unless it would “unduly disrupt” the law enforcement agency’s function within the meaning of § 207(o X5). 1 Mortensen ar *1084 gues that we must defer to the Department of Labor regulations and opinion letter construing § 207(o )(5) and hold that deputies are entitled to use CTO on a specifically requested date. In contrast, the county maintains that its leave policy and the parties’ collective bargaining agreement (“Agreement”) comply with the FLSA because the county grants CTO use within a reasonable time — up to one year — after a deputy makes a request. The county insists that under both the statute and its long-established leave practice, it may deny a CTO request for a specific date if all leave openings are full.
We do not defer to the Department of Labor regulations because the statutory language is clear. Joining the Fifth Circuit, we hold that the text of § 207(o )(5) unambiguously states that once an employee requests the use of CTO, the employer has a reasonable period of time to grant the request.
See Houston Police Officers’ Union v. City of Houston,
I
The Sacramento County Deputy Sheriffs’ Association and the county entered into the Agreement pursuant to the FLSA. 2 The Agreement specifically states that overtime is discouraged. Art. 6.1(a). However, Article 6.1(b) provides that employees may accept CTO instead of cash compensation for any overtime that they work. Article 6.1(b)(4)-(5) further provides how CTO must be used or cashed out:
4. If the department is unable to schedule and grant the time off within one year, cash payment shall be made in lieu of compensating time.
5. Compensatory Time Off shall be used within one year from the time overtime was performed. If the department is unable to schedule and grant the time off within one year, cash payment shall be made in lieu of compensating time.
* * *
Sacramento County Sheriffs Department General Order 15/02 provides:
Division Commanders shall schedule CTO consistent with the department’s operational requirements. This scheduling authority is delegated down to and including first line supervisors, subject to division commander’s concurrence. CTO not used within one year from the date earned shall be paid off in cash in lieu of time off.
Deputy Mortensen is employed at the Rio Consumnes Correction Center. At all relevant times, the Center maintained a specific practice for scheduling leave. The Administrative Sergeant, who is the “first-line supervisor” for a shift, maintains a leave book showing the number of employ *1085 ees who are scheduled for leave each day. The leave book has a predetermined number of available leave slots that are used to schedule all future requests for time off, including CTO. Typically, there are three leave slots available on weekdays and four leave slots available on weekends. The county set the number of leave slots to comply with the Center’s minimum staffing requirements, or roughly 80% of full jail staff, depending on the shift or area to be staffed. 3
Sacramento County asserts that the leave books serve the following purposes: maintaining proper staffing for shifts, ensuring safe and proper scheduling of personnel, attempting to stay within departmental budgets by minimizing excess overtime compensation, and avoiding excessive accrual of CTO time throughout the department. If a deputy requests CTO on a day when the leave book slots are full, the county will deny the request regardless of the availability of another deputy willing to work overtime. Morten-sen claims, and the county does not dispute, that in most cases there are deputies willing to work an overtime shift if they are given notice 24 hours in advance.
On February 26, 2001, Mortensen submitted a request to use 12 hours of CTO on “March 11, 2001 only.” The request was denied because the leave book was full for that day. Mortensen did not informally appeal. At the time of his CTO request, there were eighteen alternate days with open leave slots available in the period between February 26, 2001, and April 22, 2001.
Mortensen sued for injunctive relief, alleging that the county’s policy governing deputies’ use of CTO violates § 207(o)(5) of the FLSA. Mortensen contends that the county must grant his request to use CTO on a specific date unless the county shows that the request would unduly disrupt its operations. He asserts that the availability of qualified substitute staff with 24 hours’ notice renders any request to use CTO made more than 24 hours in advance of the intended use date “reasonable” under the statute. The county contends that neither the Agreement nor the FLSA give an employee unilateral discretion to schedule CTO.
On cross-motions for summary judgment, the district court granted the county’s motion, finding that both the practice of maintaining a leave book and the Agreement’s provision requiring CTO use to be scheduled within one year are consistent with the Department of Labor (“DOL”) regulations. The district court concluded that summary judgment was appropriate because Mortensen did not present evidence that the county failed to comply with its leave book policies, or failed to grant CTO use within one year.
II
A
The county contends that Mortensen lacks standing because he has not alleged any injury. It also asserts that
*1086
Mortensen has not shown a significant possibility of future harm, which is required to seek injunctive relief. We review de novo a district court’s determination that a particular party has standing.
Fair Housing of Marin v. Combs,
There are three requirements for Article III standing. First, Mortensen must have suffered an injury in fact. Second, he must show a causal relationship between the injury and the challenged conduct. Third, there must be a likelihood that his injury will be redressed by a favorable decision from the court.
See Bras v. Cal. Pub. Utils. Comm’n,
B
Mortensen contends that under the FLSA, 29 U.S.C. § 207(o )(5), and its accompanying regulations, the county is required to allow him to use accrued CTO on days he specifically requests, unless the county shows that granting the request would “unduly disrupt” the operation of the Sheriffs Department. The county responds that the FLSA and the Agreement do not allow an employee unfettered discretion in scheduling his CTO. Thus, we must determine the correct interpretation of § 207(o )(5), and whether the county properly applies the statute to its operations.
We review de novo the district court’s grant or denial of a motion for summary judgment.
Hargis v. Foster,
1
Under
Chevron, U.S.A., Inc. v. Natural Resources Defense Council,
The FLSA provides that hourly employees who work in excess of 40 hours per week must be compensated for the excess hours at a rate not less than one-and-a-half times their regular hourly wage. 29 U.S.C. § 207(a)(1);
see also Christensen v. Harris County,
(1) Employees of a public agency ... may receive, in accordance with this subsection and in lieu of overtime compensation, compensatory time off at a rate not less than one and one-half hours for each hour of employment for which overtime compensation is required by this section.
(2) A public agency may provide compensatory time under paragraph (1) only
(A) pursuant to
(i) applicable provisions of a collective bargaining agreement, memorandum of understanding, or any other agreement between the public agency and representatives of such employees; or
(ii) in the case of employees not covered by subclause (i), an agreement or understanding arrived at between the employer and employee before the performance of the work; and
(5) An employee of a public agency which is a State, political subdivision of a State, or an interstate governmental agency—
(A) who has accrued compensatory time off authorized to be provided under paragraph (1), and
(B) who has requested the use of such compensatory time, shall be permitted by the employee’s employer to use such time within a reasonable period after making the request if the use of the compensatory time does not unduly disrupt the operations of the public agency.
29 U.S.C. § 207(o).
The county and Mortensen offer conflicting interpretations of § 207(o )(5)(B). The county contends that the plain language of the statute and the Agreement are unambiguous and do not allow employees to dictate a specific date on which they may use their CTO. Specifically, the county contends that the phrase “within a reasonable period after making the request” requires the county to authorize an employee’s use of accrued CTO within a certain time period (a “reasonable period”) after the date that the employee requests to use the CTO. Under this interpretation, the use of CTO may be delayed if the employee’s request would “unduly disrupt” the county’s operations.
In contrast, Mortensen claims it is equally plausible that the statute requires the county to allow the employee to use the CTO on the specific date requested, unless it would “unduly disrupt” the agency’s operations. Claiming that the statute is ambiguous, Mortensen concludes that we must rely on the DOL’s implementing regulations, 29 C.F.R. § 553.25, 4 and a *1088 1994 DOL Wage and Hour Division Opinion Letter. 5
We have not previously considered whether § 207(o)(5) is ambiguous. Although a few courts have interpreted § 207(o)(5), most did not address the threshold question of ambiguity.
6
The only court to confront the question squarely found the statute unambiguous.
See Houston Police Officers’ Union v. City of Houston,
The text of section 207(o )(5) plainly defines the period between the date the employee submits his request and the date the employer allows the employee to use the comp time: the employee “shall be permitted ... to use such [comp] time within a reasonable period after making the request.” 29 U.S.C. § 207(o )(5). As the City suggests, mandating a “reasonable period” for use of comp time is different from mandating the employee’s chosen dates. The language offers a span of time to the employer, the beginning of which is the date of the employee’s request.
Id. (emphasis added).
Mortensen objects to the above interpretation because he claims that it gives the employer unfettered discretion to decide when an employee can use his CTO. He argues that this interpretation subsumes the “unduly disruptive” analysis into the “reasonable period” analysis because the employer can always find an alternate day to grant CTO use, whether it be several days or months in the future. The Fifth Circuit persuasively dismissed a similar argument, stating:
Instead of obscuring the proper object of the “reasonable period” clause, the “unduly disrupt” clause serves to clarify its obvious meaning. The “reasonable period” clause imposes upon the employer the obligation to facilitate the employee’s timely usage of his accrued compensatory time. The “unduly disrupt” clause suggests conditions, however, that would release the public employer from the previously imposed condition. The statute, thus construed, reflects a balance between obligation and exemption.
Houston,
Prior Supreme Court authority and our own precedent interpreting § 207(o )’s legislative history are in harmony with the Fifth Circuit’s analysis.
See Christensen v. Harris County,
When we ruled on the issue of whether the FLSA prohibits public employers from forcing employees to use CTO, we recognized that “[t]he fact that the FLSA allows employees to use comp time and requires the employer to allow use of comp time does not mean that employees have absolute discretion over the use of comp time.”
Collins,
[u]nlike private employers, public employers cannot pass the operating costs associated with overtime pay to consum *1090 ers, and Congress therefore provided public employers with an alternative. If, as Appellants argue, employees could stockpile comp time and eventually force public employers to pay overtime, employees could remove that alternative and essentially nullify the amendment.
Id. at 1129.
The same reasoning applies here. If Mortensen could force the county to pay another deputy overtime so that he could use his CTO, then the purpose for § 207(o) would be eviscerated. This requirement would burden the county considerably by increasing the overtime that it must pay to employees. If implemented, Mortensen’s proposed construction would remove the flexibility and control from the county that is clearly contemplated by the FLSA.
We conclude that the text of § 207(o )(5) unambiguously states that once an employee requests the use of CTO, the employer has a reasonable period of time to allow the employee to use accrued time. Because the statutory language is unambiguous, we need not defer to the regulations and opinion letter.
See Christensen,
2
Our determination that “reasonable period” refers to the time from the date that a request is submitted until the county actually allows the employee to use the CTO does not end our inquiry. We must also decide what constitutes a “reasonable period.” In other words, how long does the county have to schedule CTO after an employee makes a request? We look to the regulations because the statute does not define the phrase.
See Chevron,
Section 29 C.F.R. § 553.25 specifically provides a list of considerations for determining what constitutes a “reasonable period.” Whether a request for CTO was granted within a “reasonable period” depends upon the customary work practices of the employer, and an analysis of the terms contained in the Agreement. See 29 C.F.R. § 553.25(c).
It is undisputed that the county has used its leave book system to schedule all leave, including CTO, for several years. According to the county, the leave book “accounts for and avoids undue disruptions by ensuring minimum staffing levels, safe and fair scheduling, and minimizing overtime.” Although Mortensen repeatedly argues that the leave book was established solely to avoid paying overtime, he presents no evidence to support this contention. Absent such evidence, we find that he has not created a material issue of fact as to the county’s purpose for using the leave book. 7
The parties’ Agreement describes how CTO is to be used or cashed out:
(4) If the department is unable to schedule and grant the [CTO] within one year, cash payment shall be made in lieu of compensating time.
(5) [CTO] shall be used within one year from the time that overtime was performed. If the department is unable to schedule and grant the time off within one year, cash payment shall be made in lieu of compensating time.
Art. 6.1(b)(4)-(5).
Although the Agreement does not use the term “reasonable period,” it plainly provides a time period for the county to either grant CTO or pay out its cash value.
See Aiken v. City of Memphis,
190 F.3d
*1091
753, 756-57 (6th Cir.1999),
cert. denied,
3
Finally, we must determine whether a genuine dispute of material fact exists regarding the county’s compliance with its leave book policy or the provisions of the Agreement. Mortensen’s position is premised exclusively on his argument that he is entitled to use his CTO on a date that he specifically requests. He presents no facts indicating that the county, through the use of its leave book, strayed from its “customary work practice” or that its denial of his request was unreasonable or in bad faith. He brings forth no evidence that the county failed to grant CTO use within one year of his request in accordance with the Agreement. In contrast, the county offers evidence that within the 60 day period of February 26, 2001 — the date that Morten-sen requested to use CTO — there were at least 18 days available in the leave book for which Mortensen could have used his CTO.
There is no evidence that the county failed to grant use of CTO within a reasonable period; therefore, we need not determine whether any specific leave request caused an undue disruption.
See Houston,
AFFIRMED.
Notes
. The FLSA provides that:
(5) An employee of a public agency which is a State, political subdivision of a State, or an interstate governmental agency—
(A) who has accrued compensatory time off authorized to be provided under paragraph (1), and
(B) who has requested the use of such compensatory time, shall be permitted by *1084 the employee’s employer to use such time within a reasonable period after making the request if the use of the compensatory time does not unduly disrupt the operations of the public agency.
29 U.S.C. § 207(o )(5).
. Although the Agreement has expired, it is undisputed that it still governs the parties' relationship while they negotiate a new agreement.
. When requesting CTO, deputies have access to the leave book, which allows them to review every slot over a 60 day calendar period. Deputies may request CTO based only on the slots that are available. All requests must be approved by. an Administrative Sergeant. Once all leave slots are full on a particular day, the county denies all further requests for discretionary leave, including CTO, to avoid the shift from being under-staffed.
If a deputy's request is denied he may informally appeal to his supervisor, who may reverse the denial in special circumstances. In certain instances, the county has paid overtime to another deputy to avoid being understaffed in order to accommodate a CTO request.
. The regulation reads:
(a) Section 7(o )(5) of the FLSA provides that any employee of a public agency who has accrued compensatory time and requested use of this compensatory time, shall be permitted to use such time off within a "reasonable period” after making the request, if such use does not "unduly disrupt” the operations of the agency. This provision, however, does not apply to "other *1088 compensatory time” (as defined below in § 553.28), including compensatory time accrued for overtime worked prior to April 15, 1986.
(b) Compensatory time cannot be used as a means to avoid statutory overtime compensation. An employee has the right to use compensatory time earned and must not be coerced to accept more compensatory time than an employer can realistically and in good faith expect to be able to grant within a reasonable period of his or her making a request for use of such time.
(c) Reasonable Period.
(1) Whether a request to use compensatory time has been granted within a "reasonable period” will be determined by considering the customary work practices within the agency based on the facts and circumstances in each case. Such practices include, but are not limited to (a) the normal schedule of work, (b) anticipated peak workloads based on past experience, (c) emergency requirements for staff and services, and (d) the availability of qualified substitute staff.
(2) The use of compensatory time in lieu of cash payment for overtime must be pursuant to some form of agreement or understanding between the employer and the employee (or the representative of the employee) reached prior to the performance of the work. (See § 553.23.) To the extent that the conditions under which an employee can take compensatory time off are contained in an agreement or understanding as defined in § 553.23, the terms of such agreement or understanding will govern the meaning of "reasonable period.”
(d) Unduly Disrupt. When an employer receives a request for compensatory time off, it shall be honored unless to do so would be "unduly disruptive” to the agency's operations. Mere inconvenience to the employer is an insufficient basis for denial of a request for compensatory time off. (See H. Rep. 99-331, p. 23.) For an agency to turn down a request from an employee for compensatory time off requires that it should reasonably and in good faith anticipate that it would impose an unreasonable burden on the agency’s ability to provide services of acceptable quality and quantity for the public during the time requested without the use of the employee's services.
29 C.F.R. § 553.25.
. The Opinion Letter states in relevant part:
It is our position, notwithstanding the [Agreement], that an agency may not turn down a request from an employee for compensatory time off unless it would impose an unreasonable burden on the agency’s ability to provide services of acceptable quality and quantity for the public during the time requested without the use of the employee's services. The fact that overtime may be required of one employee to permit another employee to use compensatory time off would not be a sufficient reason for an employer to claim that the compensatory time off request is unduly disruptive.
Wage and Hour Division Opinion Letter,
. Mortensen relies on district court opinions that interpret this provision by deferring to the regulations without first determining whether the statute is ambiguous.
See DeBraska v. City of Milwaukee,
. Mortensen contends that he cannot be bound by the leave book policy because it is not a negotiated part of the Agreement. However, 29 C.F.R. § 553.25(c)(1) does not require that a customary work practice be set forth in the Agreement.
