MDI Rock

Based in San Tan Valley, Arizona, MDI Rock supplies sand and gravel and stone to homeowners, landscapers and contractors across the area. Google lists the business under 5 categories — Building materials store, Crushed stone supplier, Granite supplier, Sand & gravel supplier — which points to a broader inventory than a single-product yard carries.

The business holds a 4.1-star Google rating from 86 reviews. For comparison, the Arizona average across 424 listed suppliers is 4.5.

What MDI Rock supplies

Aggregate yards carry crushed stone, pea gravel, road base, mason sand, concrete sand and structural fill. Material is graded by particle size, and the correct grade depends entirely on whether you are building a compacted base, a drainage layer or a walking surface.

Road base (often called crusher run or 21AA) compacts hard and is the right choice under pavers or driveways. Clean washed stone such as #57 drains freely and is used for French drains and trench backfill. Pea gravel looks good underfoot but migrates and needs edging to stay put.

Stone yards carry flagstone, wall stone, boulders, river rock, cobbles and decorative gravel, usually sold by weight and frequently palletized for hardscape crews.

Because MDI Rock carries several material lines, it is often possible to combine an order across products — soil, mulch and stone on one truck — rather than paying separate delivery charges to two or three different yards.

How much material you need

Sand and gravel is sold by the ton. Aggregate is sold by weight, not volume — one cubic yard of crushed stone runs roughly 1.4 tons.

As a rough guide: 1 ton covers about 100 sq ft at 2 in; 5 tons covers about 500 sq ft at 2 in; 20 tons covers about 2,000 sq ft at 2 in.

Have length, width and target depth ready when you phone. Yard staff convert those into tons far more reliably than a generic online calculator, and they know how their own material settles.

Ordering and delivery

Ask about delivery minimums and trip charges up front — for smaller orders these often matter more to the final bill than the headline per-ton price.

Check where the truck can actually dump. Tandem trucks need overhead clearance and firm ground, and most drivers will not reverse across a soft lawn or a new driveway. If access is tight, ask whether they run a smaller truck or can leave the load at the kerb.

Pricing for bulk material is rarely published in full, since it moves with stock and season. The business website may list current products, but a phone call will get you a firm delivered number faster.

Ratings and reputation

Of the 86 reviews on file, 60 are five-star (70%) and 7 are four-star. 16 reviews sit at one or two stars, and those are worth reading directly — complaints at material yards usually concern delivery timing or short loads rather than the product itself.

Among the suppliers we list across Arizona, this rating places MDI Rock in the top 85%.

Across the 12 suppliers we list in San Tan Valley, the average rating is 4.7.

Review volume matters as much as the score. A 4.1 drawn from 86 reviews reflects a substantial track record.

Hours and visiting the yard

MDI Rock is open 6 days a week, closed on Sunday. The yard opens as early as 6 AM and runs until 4 PM, early enough to load before a normal work day begins.

Saturday opening makes this a practical option for weekend projects — a real advantage, since plenty of bulk yards shut for the weekend and leave homeowners unable to collect material outside working hours.

Loading is weather-dependent whatever the posted hours say. Heavy rain turns yards to mud and makes wet material heavier and harder to spread, so call the same morning if conditions look poor.

Best time to buy in Arizona

Arizona's longer growing season spreads demand across more of the year, which generally means better availability than northern markets. Even so, spring remains the peak for sand and gravel, and summer heat makes midday loading and installation punishing — early-morning pickups are worth the alarm clock. Autumn and winter are frequently the best value windows, with shorter queues and more flexible delivery scheduling.

Other suppliers nearby

There are 6 other suppliers we list within a short drive, the closest being Red Rock Junk Removal in San Tan Valley, roughly 5 miles away. 73 suppliers sit within a 25-mile radius of this yard.

If this yard is short on what you need, the suppliers listed below carry overlapping inventory and will often deliver into the same area.

Buying sand and gravel in San Tan Valley

We list 12 bulk suppliers in San Tan Valley and 424 across Arizona, spread over 54 cities and towns.

Bulk material pricing is intensely local. Trucking is a large share of the delivered cost, which is why a nearby yard usually beats a cheaper one further out once the full quote lands.