Diquat in Well Water: The Public 0.02 mg/L Line

By SubcontractorHub Editorial Team·Published October 2026

A herbicide panel can list several names that share a short runoff sentence, and the digit next to diquat is easy to misread as 0.2. Dropping a zero is how a 0.02 row becomes dalapon's 0.2. Dealers who sell treatment still have to say which public line they are reading. SubcontractorHub is software for the customer record. This page is the row. It is not a treatment design, and it is not medical advice.

Glyphosate, at 0.7 mg/L, uses a herbicide-use source cell and a different health cell: glyphosate in well water. Dalapon, at 0.2 mg/L, is a rights-of-way herbicide, not this row: dalapon in well water. Atrazine, at 0.003 mg/L, names row crops: atrazine in well water.

The 0.02 Line Is Not Endothall's 0.1

EPA's national primary table, fetched the day this page was written, lists diquat with an MCLG of 0.02 mg/L and an MCL of 0.02 mg/L. The potential-effects cell says cataracts. The source cell says runoff from herbicide use. Footnote 2 says units are milligrams per liter unless otherwise noted, and that milligrams per liter are equivalent to parts per million. This row did not opt out of that unit.

Endothall, on that same table, prints 0.1 mg/L in both the goal cell and the MCL cell. Its health cell says stomach and intestinal problems. Its source cell also says runoff from herbicide use. Sharing that source sentence is not sharing the digit, and sharing the word herbicide is not sharing the health cell. Cataracts are not a stomach sentence. Quoting a bare herbicide-runoff line without the name lets the next reader pick endothall, or pick glyphosate at 0.7 mg/L, which uses the same short source sentence and a kidney-and-reproductive health cell.

Dinoseb, on that same table, prints 0.007 mg/L on both cells. Its health cell says reproductive difficulties. Its source cell says runoff from herbicide used on soybeans and vegetables. That source cell names crops. Diquat's source cell does not. Dalapon, at 0.2 mg/L, is one zero away in a careless copy and names rights of way, not this row. The opening sentence of the national page says these standards apply to public water systems. It does not name a single-home well. If the jug on the counter is a private well, say so. Do not write the public MCL as if the well were a public system.

What the Diquat in Well Water Note Holds

The table above is the note. It is not a quote, and it is not a removal design. A customer who wants a price still needs a test, a model, and a scope. Those live on the job. This page only stops the endothall sentence, or a dropped zero that makes 0.02 look like 0.2, from landing on a cataract row that said 0.02.

No Removal Percent Is Printed Here

Footnote 1 says an MCL is set as close to the goal as feasible using the best available treatment technology and taking cost into consideration. That sentence is a definition of how an MCL is set. It is not a percent a cartridge will remove, and it is not a price. The technology table that marks carbon, aeration, or oxidation was not fetched for this row on this date, so this page does not invent an X.

How a mark on that table differs from a treatment technique is what best available technology means. If you sell carbon, say you sell carbon. Do not say a mark you did not fetch is a guarantee on this well. No removal percentage was fetched for this row, so none is printed here. No installed price was fetched, so none is printed. No CAS number was fetched for this row on this date, so none is printed. Write the identifier the lab printed.

What Should the Diquat in Well Water Note Say?

Five lines keep the next visit from borrowing endothall, or from writing a removal claim the table did not print. Name the contaminant the lab printed, show both cells, and keep the zero in 0.02.

1. The contaminant name as the lab printed it, and not endothall and not glyphosate.
2. The result and the unit. If the unit is not milligrams per liter, do not drop the unit and call the result 0.02.
3. The public pair you compared it with: MCLG 0.02 mg/L and MCL 0.02 mg/L, named as the national diquat row.
4. Whether the sample is a private well or a public system. The national page names public water systems. It does not name a single house.
5. What you did not claim: no removal percent, no installed price, no CAS, and no statement that 0.02 mg/L is endothall's 0.1 or dalapon's 0.2.

Where the Row Sits on the Job

Diquat in well water belongs with the customer, the address, and the date of the sample. A price for equipment is a later page, after someone has read this row and the rows next to it. Mixing the 0.02 line into a carbon quote because the panel listed several herbicides skips the name and skips the fact that endothall is a different digit on a similar source sentence.

The health cell on the fetched table is cataracts, described as a potential effect of long-term exposure above the MCL. That sentence is the public table's cell. It is not a finding about the household, and it is not a reason to add a medical claim the lab did not print. If a customer asks what the number means for a person, the honest line is that this page is not medical advice.

Both cells print 0.02 mg/L. That match is what the table printed. It is not a promise that the lab result was 0.02, and it is not a promise that a private well has no diquat. Write both cells. Write the zero. A note that says 0.2 has left this row and landed on dalapon.

Glyphosate's source cell is also runoff from herbicide use, at 0.7 mg/L, with kidney problems and reproductive difficulties. Do not average a cataract cell with a kidney cell because the source sentences look alike. Picloram, at 0.5 mg/L on both cells, says liver problems and herbicide runoff. That is another herbicide row, and it is not 0.02.

How a dealer reads a full panel, including which tests were actually run, is the well water testing guide. The difference between a goal and an enforceable level is MCL and MCLG. The software that holds the customer file is water treatment contractor software. This article does not size a filter and does not tell a household the water is safe to drink.

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