Testing private well water: what to order, where to go and what it costs
A private well is not regulated by the federal Safe Drinking Water Act or by most states, so testing is up to you [1]. EPA recommends testing every year for total coliform bacteria, nitrates, total dissolved solids and pH [2], at a laboratory certified by your state [3]. At state public health labs a single test costs about $15–$46 and a broad homeowner package about $450 (approximate, as of September 2026) [4] [5].
Updated 2026-09-29 · every regulation and price links to its source at the bottom of the page. A guide, not a construction design.
Is well water testing required by law?
Not federally. In EPA’s words, the quality and safety of water from private domestic wells “are not regulated by the Federal Government under the Safe Drinking Water Act nor by most state governments and laws.” The enforceable limits apply to public water systems; for a private well they are benchmarks, and the owner is responsible for testing and treatment [1].
Testing still gets asked for at key moments. The Wisconsin state lab, for example, sells a separate package for HUD/FHA-VA mortgage requirements for $146 [5].
What should you test your well water for?
EPA’s baseline is a yearly test for total coliform bacteria, nitrates, total dissolved solids (TDS) and pH. Test more often if children, older adults or a pregnant woman live in the home, and right away after a flood, after a change in taste, odor or appearance, or after well repairs [2]. The table shows what each result is compared with.
| Test | US benchmark | Type of limit |
|---|---|---|
| E. coli / total coliform | E. coli must be absent [6] | Enforceable for public water |
| Nitrate / nitrite | 10 mg/L as N (about 44 mg/L as NO₃) / 1 mg/L as N [7] | Enforceable for public water |
| Total dissolved solids | 500 mg/L [8] | Secondary — a “reasonable goal”, not enforceable |
| pH | 6.5–8.5 [8] | Secondary |
| Iron / manganese | 0.3 / 0.05 mg/L [8] | Secondary |
| Chloride / sulfate | 250 / 250 mg/L [8] | Secondary |
| Sodium | 20 mg/L for very low-sodium diets; 30–60 mg/L for taste [9] | Advisory only |
| Hardness | No limit; over 180 mg/L as CaCO₃ counts as very hard [10] | Reference classes only |
What should you add if you plan a softener or filter?
Treatment equipment has input limits, so the test has to cover them. A water softener is generally recommended only when pH is above 6.7, hardness is 3–20 grains per gallon (50–350 mg/L) and dissolved iron is below 5 mg/L [11]. Birm-type iron filters need dissolved oxygen and a pH of at least 6.8 for iron and 7.5 for manganese [12].
For UV disinfection, one New York county standard requires the water reaching the lamp to have no more than 0.3 mg/L iron, 0.05 mg/L manganese, 300 mg/L hardness, 1 mg/L hydrogen sulfide, 1 NTU turbidity and a color of 15 [13]. So for a treatment plan, order hardness, iron, manganese, pH, TDS, chloride, sulfate and sodium on top of bacteria and nitrate, and hydrogen sulfide if the water smells of rotten eggs.
Choose water treatment from your test →
Where do you get well water tested?
At a laboratory certified for drinking water. In the US, states run the certification programs; EPA itself does not test private wells. EPA’s advice is that owners “may contact your state program for guidance or directly contact a certified laboratory to pay to have your private well tested” [3]. Your county or local health department is the other route, and sometimes testing there is free [2].
Ask for a lab report with the method and the units for each result, so you can compare it with the benchmarks above.
How do you take and ship a well water sample?
Start by ordering the lab’s kit: the lab supplies the bottles and the instructions. The Wisconsin homeowner package, for example, comes as a five-bottle kit [5]. Read the instructions before opening a bottle — they tell you which tap to use, whether to run the water first and how quickly the sample must reach the lab.
We did not find a national sampling rule for private wells; the lab’s own procedure is what counts. Retest after a flood or well repairs, as EPA advises [2].
How much does a well water test cost?
Two state public health labs as examples. Neither price list shows a date; prices are approximate, as of September 2026.
| Test | Wisconsin State Laboratory of Hygiene [5] | Maryland Department of Health lab [4] |
|---|---|---|
| Bacteria (coliform, E. coli) | $35 | $41 |
| Nitrate | $35 | $18 |
| Hardness | $46 | $23 |
| Iron | $38 | $20 |
| Manganese | $38 | — |
| Metals screen | $97 | — |
| Fluoride | $33 | — |
| Turbidity | — | $15 |
| Copper, lead | — | $20 each |
| Homeowner package: bacteria, nitrate/nitrite, fluoride, metals, hardness, VOCs, atrazine | $450 | — |
Frequently asked questions
How often should I test my well water?
EPA recommends once a year for coliform bacteria, nitrates, TDS and pH, more often with children, older adults or a pregnant woman at home, and right after a flood or well repairs [2].
Is well water testing required by law?
Not by federal law, and not by most states: the owner is responsible [1].
How much does it cost to test well water?
At state labs, roughly $15–$46 per test and about $450 for a broad homeowner package (approximate, as of September 2026) [4] [5].
Where can I get my well water tested?
At a lab certified by your state’s drinking water certification program, or through your county health department [3] [2].
What nitrate level is safe in well water?
The federal limit for public water is 10 mg/L as nitrogen (about 44 mg/L as nitrate); for a private well it is the benchmark to use [7].
Sources
- US EPA — Private Drinking Water Wells (landing page) (US) · regulation · checked 2026-09-29 · source
- US EPA — Private Drinking Water Wells: Protect Your Home's Water, Testing frequency; Where to test your water (US) · recommendation · checked 2026-09-29 · source
- US EPA — Contact Information for Certification Programs and Certified Laboratories for Drinking Water (US) · regulation · checked 2026-09-29 · source
- Maryland Department of Health Laboratories — Well Water Testing Fees (US) · price · checked 2026-09-29 · ~ · source
- Wisconsin State Laboratory of Hygiene — Public, Environmental and Water Testing Prices (US) · price · checked 2026-09-29 · ~ · source
- 40 CFR 141.63 Maximum contaminant levels (MCLs) for microbiological contaminants (National Primary Drinking Water Regulations; Revised Total Coliform Rule), (c) (US) · regulation · checked 2026-09-29 · source
- 40 CFR 141.62 Maximum contaminant levels (MCLs) for inorganic contaminants (National Primary Drinking Water Regulations), (b)(7)–(9) (US) · regulation · checked 2026-09-29 · source
- 40 CFR 143.3 Secondary maximum contaminant levels (National Secondary Drinking Water Regulations), § 143.3 (US) · recommendation · checked 2026-09-29 · source
- US EPA Drinking Water Advisory: Consumer Acceptability Advice and Health Effects Analysis on Sodium (EPA 822-R-03-006, 2003), Executive summary / Consumer acceptability (US) · recommendation · checked 2026-09-29 · source
- USGS Water Science School — Hardness of Water, General guidelines for classification (US) · recommendation · checked 2026-09-29 · source
- Penn State Extension — Iron and Manganese in Private Water Systems, Water Softeners (US) · recommendation · checked 2026-09-29 · source
- Penn State Extension — Iron and Manganese in Private Water Systems, Oxidizing Filters (Birm) (US) · recommendation · checked 2026-09-29 · source
- Chautauqua County (NY) Environmental Health Services — Private Drinking Water Standard for Ultra Violet (UV) Light Disinfection System, Water Quality; installer checklist (US) · regulation · checked 2026-09-29 · source
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