Water Services. Revenue increased $65.0 million, or 39.7%, to $228.6 million for the Current Quarter compared to $163.6 million for the Prior Quarter. The increase was primarily attributable to higher demand for our services coupled with increased pricing in comparison to the Prior Quarter. The increase was also impacted by incremental revenue contributed by the Nuverra and Breakwater acquisitions.
Water Infrastructure. Revenue increased by $43.0 million, or 73.4%, to $101.5 million for the Current Quarter compared to $58.6 million for the Prior Quarter. The increase was primarily attributable to higher demand for our services in comparison to the Prior Quarter, as well as by incremental revenue contributed by the Nuverra, Breakwater, Cypress and other asset acquisitions.
Oilfield Chemicals. Revenue increased $13.8 million, or 19.1%, to $86.4 million for the Current Quarter compared to $72.6 million for the Prior Quarter. The increase was primarily attributable to higher demand for our services in comparison to the Prior Quarter and was not directly impacted by acquisition activity.
Costs of Revenue
Costs of revenue increased $86.8 million, or 32.2%, to $356.9 million for the Current Quarter compared to $270.1 million for the Prior Quarter. The increase was primarily composed of a $44.7 million increase in Water Services costs, a $28.2 million increase in Water Infrastructure costs, and a $7.5 million increase in Oilfield Chemicals costs due to supporting the higher revenue-producing activity discussed above.
Water Services. Costs of revenue increased $44.7 million, or 32.6%, to $181.7 million for the Current Quarter compared to $137.0 million for the Prior Quarter. Cost of revenue as a percent of revenue decreased from 83.8% to 79.5% due primarily to higher pricing for our services and economies of scale from higher revenue activity.
Water Infrastructure. Costs of revenue increased $28.2 million, or 63.5%, to $72.6 million for the Current Quarter compared to $44.4 million for the Prior Quarter. Cost of revenue as a percent of revenue decreased from 75.8% to 71.5% due primarily to a higher relative contribution of high-margin disposal revenue as well as increased water treatment and recycling margins, which were favorably impacted by the Breakwater acquisition.
Oilfield Chemicals. Costs of revenue increased $7.5 million, or 12.1%, to $69.7 million for the Current Quarter compared to $62.2 million for the Prior Quarter. Cost of revenue as a percent of revenue decreased from 85.6% to 80.6% due primarily to picking up additional higher-margin market share within our portfolio of products.
Depreciation and Amortization. Depreciation and amortization expense increased $6.4 million, or 24.3%, to $32.9 million for the Current Quarter compared to $26.5 million for the Prior Quarter, due primarily to a higher fixed asset base related to acquisitions occurring after December 31, 2021.
Gross Profit
Gross profit was $59.7 million for the Current Quarter compared to $24.7 million for the Prior Quarter due primarily to higher revenue in all three segments resulting from increased activity levels and pricing. Gross profit increased by $20.3 million, $14.8 million and $6.3 million in our Water Services, Water Infrastructure and Oilfield Chemicals segments, respectively. Partially offsetting the increase in gross profit was a $6.4 million increase in depreciation and amortization expense. Gross margin as a percent of revenue was 14.3% and 8.4% in the Current Quarter and Prior Quarter, respectively.
Selling, General and Administrative Expenses
Selling, general and administrative expenses increased $7.5 million, or 26.5%, to $35.8 million for the Current Quarter compared to $28.3 million for the Prior Quarter. The increase was due primarily to $2.1 million higher wages, associated payroll taxes and employer 401(k) match contributions, a $1.6 million increase in business development costs, a $1.4 million increase in bad debt expense, a $1.1 million increase in incentive and equity-based compensation cost, $0.8 million in rebranding costs, $0.5 million higher information technology costs, $0.5 million in higher contract