Step 1 Part 2: Soil & Water
Picking up from last week
We started The Grain Truth with the soil — why fertilizer dependency isn't simple, why organic certification takes three years, and why regenerative practices like cover cropping come with real costs that keep most farms from doing everything at once. We also told you upfront: we mill fresh flour for a living, so weigh what follows accordingly.
We ended there with your bread. Nitrate in wheat is low — not zero, but low, and the flour genuinely isn't where this story lives. Bread is barely more than water, flour, and salt, though, and if the flour isn't carrying much of this forward, the water folded into every loaf might be. That's what we're picking up now.
The water underneath it
A lot of American wheat country — including the Southern Plains region we source from — sits over the Ogallala Aquifer, one of the largest groundwater reserves in the world. It supports roughly a fifth of the nation's wheat, corn, cotton, and cattle production, and in large stretches, withdrawal has outpaced natural recharge for decades.
But "wheat country sits on a shrinking aquifer" is a different claim than "wheat is shrinking the aquifer" — and the difference matters. Irrigation accounts for about 90% of everything pulled from the Ogallala, and most of that goes to corn, soybeans, and cotton, which are simply more profitable under irrigation than wheat is. Federal crop insurance sweetens that math further: insurers pay out more generously on irrigated crops than dryland ones, which pushes some operations to keep pumping in years they might otherwise scale back. That's a policy and commodity-economics problem as much as it's a farming one.
Wheat sits on the other side of that line more often than people assume. Across much of the region, wheat is grown dryland — no irrigation at all — because it doesn't need what corn needs. That's not a virtue anyone's claiming credit for; it's just a different crop with a different water footprint, farmed the way it's always been farmed in places too dry for much else.
Here's where soil comes back into it. Soil organic matter holds water — Rothamsted Research estimates every 1% increase in soil organic carbon adds roughly 354,000 liters of water-holding capacity per hectare. Cover cropping and reduced tillage build that organic matter over time, which means better drought resilience for dryland wheat and less irrigation demand wherever irrigation is used at all.
And here's the honest complication - Organic certification doesn't touch any of this on its own.
An irrigated organic cornfield draws exactly as much from the aquifer as a conventional one — certification says nothing about water. The actual lever is the same one from our soil discussion: cover cropping, reduced tillage, and dryland farming, which some organic operations practice and some don't, same as conventional ones. Practices like these — dryland farming, cover cropping, rotational grazing, decades without synthetic inputs — are part of what we weigh when choosing who to source from. It's not merely about a certification label. It's about how the land's actually been farmed.
What today's high-input yields are quietly borrowing from tomorrow's is real. It's just a narrower, more specific story than "wheat is draining the aquifer" — and it's worth telling accurately.
How much of this actually ends up in your water
Nitrate, the form of nitrogen in synthetic fertilizer, is highly soluble and moves through soil into groundwater easily. The EPA's safety limit is 10 mg/L, set to protect against methemoglobinemia — "blue baby syndrome" — in infants. USGS monitoring has found nitrate above that limit in more than 1 in 5 shallow household wells in agricultural areas, and fertilizer runoff, manure, and septic systems all contribute. Private wells carry the most risk, since they aren't federally regulated the way public water systems are.
Where you live inside that range matters more than any single average, so here's the range, worst to best.
The extreme — Texas Panhandle, 2025
~28,000 mcg/day
In 2025, the Red River Authority of Texas issued nitrate violation notices for a water system in the Texas Panhandle, reporting 14 mg/L — 40% over the federal limit. At 2 liters a day, that's roughly 98 times our generous flour estimate from last week.
National average, U.S. utilities
~1,650 mcg/day
0.824 mg/L average — still nearly six times the flour number.
Texas state average
~1,050 mcg/day
0.525 mg/L average — about three times the flour number.
City of Sherman, our home water
~256 mcg/day
0.128 mg/L — at or below the flour estimate.
City of Denison
~131 mcg/day
0.065 mg/L — the cleanest reading in this range.
And now the better news, plainly stated: our own water, here at home, tests clean. If you live in Grayson County, your tap water isn't the extreme case. It's closer to the good end of this range than the bad one. But just like in Part 1, the answer is:
Low. Not Zero. Low.
Where this leaves us, and what isn’t up for debate.
Your bread was never carrying much nitrate to begin with — that's true whether the wheat was grown organically or conventionally. The real debate is about water: does organic farming send less nitrate toward the aquifer and the wells nearby? The research is genuinely split. Organic systems typically apply less total nitrogen, which usually means less leaching per acre — but organic yields tend to be lower too, and once you measure leaching per bushel instead of per acre, that advantage shrinks and sometimes disappears. Each side can point to a real study. Neither side gets to claim a clean win.
What isn't up for debate is the regenerative practice of cover cropping. A global analysis of 41 studies found cover crops reduce nitrate leaching by an average of 69% compared to bare ground between plantings — the strongest, most consistent number in any of the research we found on this question, and it holds regardless of whether the farm is certified organic or not.
That's a real part of why we look for partners doing both — organic and regenerative — rather than treating either one alone as the whole answer. A certification tells you what wasn't sprayed. Cover cropping, rotational grazing, and reduced tillage tell you what's actually happening to the ground and the water underneath it. We want farms doing the second thing, with or without the label.
So — why did we just tell you all of that?
Take stock of what you actually just read. The nitrate in your bread: low. The nitrate in your water, if you live near us: low. Even at the national average, a real number, but not a frightening one on its own. Even the extreme case, the Panhandle violation — serious, worth knowing about, but still one specific place, not everywhere.
If you came into this looking for the moment where we tell you what's secretly wrong with your food, this is that moment — just not in the shape you expected. There isn't one. Not here, not in nitrate.
Here's what we think is actually true instead.
A body doesn't encounter one exposure. It encounters dozens — different substances, entering through different foods and different water and different air, clearing at different speeds, some overlapping in time with others. Researchers have a word for this: the exposome, the total sum of everything a person is exposed to across a lifetime, as distinct from any single chemical studied in isolation. It's a real, active area of environmental health research precisely because most toxicology studies one substance at a time, and almost nothing studies the combined picture of all of them together. That gap is real, and it's not something we invented to make a point.
Considered alone, nitrate exposure from your flour and water are indeed low, and we believe this is why the industry has continually failed us, and our health. Because they shouldn’t be considered alone.
That's the thesis of this whole series, if it has one. Fourteen honest steps that each contribute to a total exposure nobody has calculated for you — and honestly, probably couldn't. That's actually better news than if we'd found you a smoking gun and a single, simple fix to sell you at the end of Step 1. It would have been a tidier ending. It just wouldn't have been true.
The real picture is a number of decisions, not one — decisions that, added up, can meaningfully lower your total exposure without any single one of them needing to be dramatic. We hope replacing a good portion of your wheat consumption with our flour becomes one of those decisions. It's hardly going to be the only one this series hands you.
We'd rather you walk away with a few honest options than one oversold answer.
Soil is where a lot of that total starts. How it's treated determines what leaches into the water underneath it — and regenerative practices aren't a nice-to-have here, they're one of the most direct levers anyone has for protecting one of the most precious resources we've got: clean drinking water, for the next family and the one after that.
So what do you actually do with that?
A few honest, practical things, none of which require panic. If you're on a private well, get it tested — it's the one part of this chain that's entirely in your hands and isn't federally monitored for you. If you're on municipal water, your utility's annual water quality report is public; ours are linked below, and yours is one search away. And when you're choosing where your food comes from, the label matters less than the practices behind it — ask who grew it, how, and whether they're the kind of people trying to do better by the ground, not just checking a box.
And we'll say this plainly: we don't get you to zero either.
Even wheat grown with every practice we've described in this series — dryland, regenerative, three decades without synthetic inputs — still carries some small, real, nonzero exposure, because it's grown in the actual world, near actual water, under an actual sky, not in a sealed lab. We can get you a lower number. We can tell you honestly what we know about it and why. We can't get you a zero, and we'd rather say that upfront than let you assume otherwise.
Next up
The seed itself — modern high-yield wheat versus the heritage grains your great-grandparents would have grown, and why that choice happens before anything ever touches soil.
Sources
American Bar Association, irrigation share of Ogallala withdrawals and crop insurance dynamics · Stateline / Colorado Newsline, Ogallala production share reporting · Rothamsted Research (via National Farmers' Union), soil organic carbon water-holding capacity · EPA, Nitrogen and Phosphorus Pollution Series (nitrate MCL, well violation data) · USGS groundwater nitrate monitoring · Red River Authority of Texas, nitrate MCL violation notices, Guthrie-Dumont Water System (Q2/Q3 2025) · EWG Tap Water Database / TCEQ / EPA ECHO, utility-level nitrate averages — national, Texas, City of Sherman, City of Denison (2021–2023) · nitrogen leaching meta-analyses, organic vs. conventional farming (Hansen et al. 2000; Tuomisto et al. 2012; Seine Basin study) · Nouri et al. 2022, global cover crop meta-analysis, Global Change Biology · Wild, C.P. (2005), origin of the "exposome" concept, Cancer Epidemiology, Biomarkers & Prevention.