Simazine in Well Water: The Public 0.004 mg/L Line

By SubcontractorHub Editorial Team·Published October 2026

A herbicide panel can list several names that share a runoff sentence. The digit next to simazine is not the digit next to atrazine. 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.

Atrazine, at 0.003 mg/L, already has its own page: atrazine in well water. How a mark on a technology table differs from a treatment technique is what best available technology means. Simazine in well water is only this chemical.

The 0.004 Line Is Not Atrazine's 0.003

EPA's national primary table, fetched the day this page was written, lists simazine with an MCLG of 0.004 mg/L and an MCL of 0.004 mg/L. The potential-effects cell says problems with blood. The source cell says herbicide runoff. 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.

Atrazine, on that same table, prints 0.003 mg/L in both the goal cell and the MCL cell. Its health cell says cardiovascular system or reproductive problems. Its source cell says runoff from herbicide used on row crops. Sharing the word herbicide is not sharing the digit. Quoting a bare 0.004, or a bare 0.003, without the name lets the next reader pick the wrong cell.

Cornell's copy of 40 CFR 141.61 prints simazine as item (c)(1)(xxxii), CAS 122-34-9, MCL 0.004 mg/L. Paragraph (c) says those synthetic-organic MCLs apply to community water systems and non-transient, non-community 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 community system.

What the Simazine 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 atrazine digit, or a factory sentence, from landing on a herbicide row that said runoff.

What the GAC Mark Does Not Promise

Table 2 of the same Cornell section marks best available technology for organic contaminants, except PFAS. The columns are granular activated carbon, packed tower aeration, and oxidation. On the simazine row, granular activated carbon is marked. Packed tower aeration is empty. Oxidation is empty. Atrazine, on that same technology table, is also marked only in the carbon column. A matching pair of marks is not a matching MCL.

The paragraph that introduces the table calls those marks the best technology, treatment technique, or other means available for achieving compliance with the MCL. It does not say what percent a cartridge in a basement will remove. A city plant and a point-of-entry tank are not the same machine. If you sell carbon, say you sell carbon. Do not say the X 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.

What Should the Simazine in Well Water Note Say?

Five lines keep the next visit from borrowing atrazine, or from writing a removal claim the table did not print. Name the contaminant the lab printed, show both the goal and the MCL, and say whether the jug is a private well.

1. The contaminant name as the lab printed it, including CAS 122-34-9 if the sheet uses the number, and not atrazine.
2. The result and the unit. If the unit is not milligrams per liter, do not drop the unit and call the result 0.004.
3. The public pair you compared it with: MCLG 0.004 mg/L and MCL 0.004 mg/L, named as the national simazine row.
4. Whether the sample is a private well or a public system. Paragraph (c) names community and non-transient, non-community systems. It does not name a single house.
5. What you did not claim: no removal percent, no installed price, and no statement that 0.004 mg/L is atrazine's MCL of 0.003.

Where the Row Sits on the Job

The lab sheet 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 0.004 line into a softener quote because the panel listed several herbicides skips the name and skips the fact that atrazine is a different digit.

The health cell on the fetched table is problems with blood, 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.

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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