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Sioux Falls Private Investigators

Browse these private investigators with great ratings from Thumbtack customers in Sioux Falls.

  • 8 years in business
Verified review

Checking out an employee that was stealing from my store. Rahn got footage of my ex-worker taking stock and putting it inside a friends car.

  • 12 years in business
  • 1 hire on Thumbtack

Welcome to South Dakota Professional Services, a full-service private investigation company located in Sioux Falls, South Dakota and North Sioux City and servicing our customers in Iowa. We are licensed, bonded, and insured to serve the needs of attorneys, businesses, insurance companies, and private individuals in the states of South Dakota and Iowa. We conduct investigations such as surveillance, process serving, infidelity cases, skip tracing, and locating people and assets. For a free consultation, call now.

EPI Investigations

New To Thumbtack


    EPI is a Sioux Falls, South Dakota-based private investigative and risk management agency owned and operated by Nathan Fredrickson and Daniel Malmberg. Nathan's professional experience includes over a decade in corporate and private investigations, risk management, covert surveillance and special project management. Daniel recently joined the agency as a partner after nine years in the Marine Corps where he served as a military policeman and member of the Special Reaction Team. EPI Investigations’ focus is on serving the investigative and risk management needs of businesses, attorneys and insurance companies. The EPI Investigations and Risk Management Team also includes experienced investigators with regional, military, and federal law enforcement expertise who perform comprehensive research and investigations, covert surveillance, and many other investigative services for EPI's private, business, insurance and legal clients.


    EPI is a full service South Dakota Private Investigations & Risk Management Agency. The EPI Investigations team includes highly experienced investigators who expertly perform comprehensive research and investigations, covert surveillance, and many other investigative and risk management services for EPI's private, business, insurance and legal clients. EPI Investigations makes the process of working with a private investigator as stress free as possible. Our clients have learned to trust in our discretion and professionalism. What is more, EPI Investigations of South Dakota works diligently for our clients to get results while maintaining the highest standards of ethics and adhering to local, state and federal laws. Providing our clients with actionable results based on our years of experience providing evidence that can be used in our client's cases.

    Q & A

    Answers to commonly asked questions from the experts on Thumbtack.

    What does a private investigator do?

    First and foremost, good private investigators follow laws. Unlike on TV, they don’t break in windows or hack into hospital computer systems to get you intel. When you hire a private investigator, you’re hiring a professional to gather facts and find information for you. Although they can’t obtain certain information (such as health records), they do have access to information that most civilians do not. Often private investigators are hired to perform surveillance or background checks or investigate cases such as adultery, child custody, missing persons, hidden assets, or debugging, and theft or other crimes.

    Private investigators can be hired to interview people and provide that information to the client, perform photo or video surveillance, monitor activity at a location where you suspect criminal activities or questionable behavior, track a person’s movements, find missing people, do deep-dive background checks, and more. Private investigation can be helpful if you’re trying to get a court order but need evidence. Private investigators can also help find birth parents. Nationally, the average price range for private investigation is $70-$210 per hour.

    What does a private investigator cost?

    Private investigation isn’t just for blockbuster action movies. Hiring a private investigator can help in all kinds of situations ranging from finding a birth parent to improving personal security. Nationally, the average price range for private investigation is $70-$210, although pricing often hovers between $40 and $100 depending on the complexity of the services you need. Where you live in the country will affect your costs for private investigation; larger cities have higher business overhead and a higher cost of living, which in turn means higher service rates. The complexity of your case can also affect cost. A basic background check may have a flat rate, while hiring a private investigator to help with your child custody case may require more legwork and research, and therefore cost more. Some private investigators work on retainer. A retainer is essentially a nonrefundable deposit you pay to the professional — meaning you have retained their services — who then works against that amount. Here are some examples of average private investigation costs:

    • Hourly rate: $60-$70; costs can vary based on current fuel prices.
    • Flat rate: $100 for comprehensive background investigation services.
    • Retainer: $1,500 minimum retainer required by some pros before starting work.
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