On-Call Hydrogeological Services

The City of Modesto (City) is soliciting Request for Qualifications (RFQ) for On-Call Hydrogeological Services for the City of Modesto. Submittals are due before 5:00 pm on Wednesday, May 20, 2026 .

The City’s water supply is met by two sources: treated surface water from the Modesto Irrigation District’s (MID) Modesto Regional Water Treatment Plant (MRWTP) and the

City’s groundwater wells. The City’s annual average total water production is approximately 70 MGD, where about 40 MGD is supplied by groundwater extracted from roughly 75 operational wells within the City’s water service areas. The City faces significant water supply challenges, including regional competition for limited groundwater, drought impacts (i.e. reductions in treated surface water deliveries), and loss of wells from contamination. Hydrogeological related services are required to assist City staff to navigate through these and other water supply challenges.

The City will be designing and constructing various water related capital improvement program projects over the next several years. The City is looking to establish an On-Call Hydrogeological Engineering Services agreement with firms possessing established experience in hydrogeological engineering. As noted in Section 1 of this RFQ, The City plans to select two to three (2-3) firms to establish on-call agreements with to provide hydrogeological engineering services on an as-needed basis. Please note that the establishment of these proposed on-call agreements does not prohibit the City from hiring other firms who do not actively possess on-call agreements with the City.