Carbofuran in Well Water: The Public 0.04 mg/L Line

By SubcontractorHub Editorial Team·Published November 2026

A pesticide panel can list several fumigant names on one page. The digit next to carbofuran is not safe to borrow just because oxamyl also names the nervous system, and it is not the zero next to carbon tetrachloride. 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.

The 0.04 Line Is Not a Zero Goal

EPA's national primary table, fetched the day this page was written, lists carbofuran with an MCLG of 0.04 mg/L and an MCL of 0.04 mg/L. The potential-effects cell says problems with blood, nervous system, or reproductive system. The column header calls that a potential health effect from long-term exposure above the MCL, unless a row is specified as short-term. This row is not marked short-term. The source cell says leaching of soil fumigant used on rice and alfalfa. 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.

Both cells print 0.04. That is the point that gets lost when a neighbor's zero is pasted onto this name. Carbon tetrachloride, the next organic name on that stretch of the table, prints a goal of zero and an MCL of 0.005 mg/L. Its health cell says liver problems and an increased risk of cancer. Its source cell says discharge from chemical plants and other industrial activities. Sharing a place on the organic list is not sharing the goal, and a fumigant used on rice and alfalfa is not a chemical-plant discharge.

Oxamyl, on that same table, prints 0.2 mg/L in both cells. Its health cell says slight nervous system effects. Its source cell says runoff or leaching from insecticide used on apples, potatoes, and tomatoes. That row has its own page, oxamyl in well water. A nervous-system word on both pages is not a reason to copy 0.2 onto carbofuran, or to copy 0.04 onto oxamyl. The opening sentence of the national page says these standards apply to public water systems. It does not name a single-home well.

What the Carbofuran in Well Water Note Holds

The goal cell is 0.04 mg/L. The page defines an MCLG as the level of a contaminant in drinking water below which there is no known or expected risk to health. It says MCLGs allow for a margin of safety and are non-enforceable public health goals. On this row the goal is the same digit as the enforceable cell. It is not a lab result, and it is not a statement that the well has no carbofuran.

The MCL cell is also 0.04 mg/L. The page defines an MCL as the highest level of a contaminant that is allowed in drinking water. It says MCLs are set as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration, and that MCLs are enforceable standards. That definition is the public rule's definition. It is not a price for a filter, and it is not a percent removed.

The health cell names blood, the nervous system, or the reproductive system. That sentence is the public table's cell. It is not a finding about a person in the house. If a customer asks what the number means for a person, the honest line is that this page is not medical advice. Do not add a cancer sentence because carbon tetrachloride has one. This row did not print one.

The source cell is leaching of a soil fumigant used on rice and alfalfa. Keep the crops on the note. Do not shorten it to "pesticide" and let the next reader pick oxamyl's apples, potatoes, and tomatoes. The difference between a goal and an enforceable level is MCL and MCLG. On this row the two cells match. On carbon tetrachloride they do not.

Methoxychlor Shares 0.04 and Does Not Share the Source

Methoxychlor, on the same fetched table, also prints 0.04 mg/L in the goal cell and 0.04 mg/L in the MCL cell. Its health cell says reproductive difficulties. Its source cell says runoff or leaching from insecticide used on fruits, vegetables, alfalfa, and livestock. Alfalfa appears in both source cells. That shared crop is not a shared chemical. Carbofuran's source sentence also names rice, and it names a soil fumigant. Methoxychlor's sentence names fruits, vegetables, and livestock, and it does not name rice.

A lab that prints both names needs both notes. Matching digits are the reason the names have to stay attached. A dealer who writes "the 0.04 row" without the name has written a number that fits two chemicals and describes neither source. This page is only the carbofuran row. It does not open a methoxychlor page, and it does not print a CAS for either name.

No Removal Percent Is Printed Here

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 oxamyl's 0.2, or carbon tetrachloride's zero, from landing on a fumigant row that said 0.04 on both cells.

Best available technology, when a page names a mark, is explained in what is best available technology. No mark was fetched for carbofuran on this date, so none is printed. A carbon sentence copied from a neighbor is not this row. A banned-insecticide row at a matched 0.002 mg/L is endrin in well water. That page already warns not to borrow a neighbor's digit. The same warning applies here.

What Should the Carbofuran in Well Water Note Say?

Five lines keep the public pair from being rewritten as a private-well fine or as oxamyl.

1. The contaminant name as the lab printed it, and not oxamyl and not carbon tetrachloride and not methoxychlor.
2. The result and the unit. If the unit is not milligrams per liter, do not drop the unit and call the result 0.04.
3. The public pair you compared it with: MCLG 0.04 mg/L and MCL 0.04 mg/L, named as the national carbofuran 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 0.04 mg/L is oxamyl's 0.2 or carbon tetrachloride's zero.

Where the Row Sits on the Job

Carbofuran 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 0.04 line into a carbon quote because the panel listed several pesticide names skips the name and skips the fact that the goal on this row is not zero.

Both the goal and the MCL have to stay on the note, even when they match. Dropping the goal because it repeats 0.04 is how a later reader pastes a zero from carbon tetrachloride and calls the pages the same. Write both cells. Say they match. Do not say the match means the well passed.

A soil-fumigant sentence is easy to widen. Oxamyl's source cell is an insecticide used on apples, potatoes, and tomatoes, and its pair is 0.2 mg/L. If the lab names carbofuran, keep the matched 0.04 attached, and keep rice and alfalfa on the source line. Do not average 0.04 with 0.2 because both names can affect the nervous system.

How a dealer reads a full panel, including which tests were actually run, is the well water testing guide. The software that holds the customer file is water treatment contractor software. A flow written in liters per second, when a spec sheet uses that unit, is the gpm to liters per second converter. This article does not size a filter and does not tell a household the water is safe to drink.

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