Hobbs hard water guide (2026)
Where Hobbs water comes from, what the city's report does and doesn't tell you, what softeners and RO systems do, how to handle a private well, and who can install equipment in New Mexico.
Updated October 25, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.
Quick reference
| Topic | What to know | Source |
|---|---|---|
| Hobbs source | Ogallala Aquifer only, about 80 feet down, pumped by 33 city wells | City of Hobbs CCR (2024) |
| Hobbs hardness | Not published in the report; test at your tap | City of Hobbs CCR (2024) |
| Arsenic | 5 to 7 ppb detected; federal limit 10 ppb; no violation | City of Hobbs CCR (2024) |
| Uranium and nitrate | Uranium 4 to 8 µg/L (limit 30); nitrate up to 4.92 ppm (limit 10) | City of Hobbs CCR (2024) |
| Hardness scale | Moderately hard 3.5 to 7 gpg; hard 7 to 10.5 gpg (121 to 180 mg/L); very hard above 10.5 gpg | NDSU Extension |
| Softener sodium | About 8 mg/L added per grain of hardness removed | NDSU Extension |
| Private wells | Owner solely responsible; test bacteria and nitrate each spring, arsenic yearly, uranium every 5 years | NM Environment Department |
| Plumbing license | CID MM-1 covers installing and servicing plumbing fixtures and piping | 14.6.6 NMAC |
| Handyman exemption | Up to $7,200 a year, but never for plumbing, electrical or gas fitting | 14.6.2.8 NMAC |
Where does Hobbs water come from?
The Ogallala Aquifer, and nothing else. The City of Hobbs' 2024 Consumer Confidence Report says the aquifer is the city's only water source, that it sits approximately 80 feet beneath the community, and that the city operates 33 wells to draw from it. Hobbs is the largest city in Lea County, with 40,508 residents at the 2020 census.
How hard is Hobbs water?
The city doesn't say. Its annual report covers regulated contaminants, and hardness isn't one of them, so no number appears. The geology gives a hint: a U.S. Geological Survey report on southern Lea County, published by the New Mexico Bureau of Mines and Mineral Resources, describes the Ogallala there as chiefly a calcareous, unconsolidated sand. Calcareous means it contains calcium carbonate, and dissolved calcium is the main cause of hardness. The same report describes the chemical quality of the area's main aquifers as generally fair to good. For a real number, test at your tap. NDSU Extension's scale reads it this way: 1 to 3.5 grains per gallon is slightly hard, 3.5 to 7 is moderately hard, 7 to 10.5 is hard, and above 10.5 is very hard. One grain per gallon is about 17 mg/L.
What else does the city report show?
All results in the 2024 report were under federal limits with no violations. Arsenic was detected at 5 to 7 parts per billion against a limit of 10, and the report notes that while the water meets the standard, it does contain low levels of arsenic. Fluoride measured up to 1.1 parts per million against a limit of 4. Uranium measured 4 to 8 micrograms per liter against a limit of 30. Nitrate, as nitrogen, measured 3.58 to 4.92 parts per million against a limit of 10. Sodium measured 38 parts per million. A softener doesn't treat any of these. A certified reverse osmosis system at the kitchen tap is the usual choice for households that want to reduce them further.
Do softeners add sodium?
Yes. NDSU Extension says that for every grain of hardness removed, about 8 mg/L of sodium is added, and people on sodium-restricted diets should account for that and talk with their doctor. It suggests leaving one kitchen tap unsoftened for drinking and cooking, and it doesn't recommend softened water for houseplants, lawns or gardens. Potassium chloride can be used instead of salt, though it costs more and the softener uses about 10 percent more of it.
What about iron and manganese?
They're more of a well-water issue than a city-water one in the Hobbs report, which doesn't list them. NDSU Extension says some softeners can remove up to about 10 ppm of iron and manganese, and water with more than that may need a dedicated iron removal system ahead of the softener.
I'm on a private well. What should I do?
Test it. The New Mexico Environment Department says private well owners are solely responsible for the safety and quality of their drinking water, and its Drinking Water Bureau doesn't regulate private wells. It recommends testing every spring for coliform bacteria and nitrate, testing for arsenic every year, and testing for uranium every five years, with fluoride and other tests if you have specific concerns. If you're planning treatment, add hardness, iron, manganese and total dissolved solids to the list.
Who can install a softener in New Mexico?
The Construction Industries Division of the Regulation and Licensing Department licenses contractors. Its MM-1 plumbing classification covers installing, altering, repairing and servicing plumbing fixtures and piping, and connecting a softener to your water line is plumbing work. We didn't find a separate water-conditioning classification in the state rules. New Mexico's handyman exemption, which allows small jobs up to $7,200 in compensation a year without a contractor license, specifically excludes plumbing, electrical wiring and gas fitting. Ask the company which CID license it or its plumber holds, look it up, and ask whether your job needs a permit and who issues it.
Questions to ask a water treatment company
- Which CID license do you or your plumber hold, and what's the number?
- What hardness did you measure, and how did you size the unit from it?
- Will hose bibs and sprinklers stay on unsoftened water?
- Where will the regeneration and RO drain water go?
- How will the unit be protected if it's in a garage or outside during a freeze?
- What maintenance does the system need, and what does the warranty cover?
Common questions
How hard is Hobbs water?
The city's report doesn't publish a hardness figure. The Ogallala Aquifer there is described as calcareous sand, which points toward calcium, but only a tap test gives your number.
Is there arsenic in Hobbs water?
The 2024 city report shows 5 to 7 parts per billion, below the federal limit of 10, with no violation. A softener doesn't remove it.
Do I need a license to install a softener in New Mexico?
Softener installs are plumbing work, licensed by the Construction Industries Division under classifications such as MM-1. The handyman exemption doesn't cover plumbing.
Sources
- City of Hobbs: 2024 Consumer Confidence Report
- Nicholson and Clebsch (USGS), Geology and Ground-Water Conditions in Southern Lea County, New Mexico, NM Bureau of Mines Ground-Water Report 6 (1961)
- NDSU Extension: Water Softening (Ion Exchange)
- New Mexico Environment Department: Guidance for Owners of Private Wells
- 14.6.6 NMAC: Construction Industries Division license classifications
- 14.6.2 NMAC: Construction Industries licensing, including 14.6.2.8 exemption
- Wikipedia: Hobbs, New Mexico
- Wikipedia: Lovington, New Mexico
- Wikipedia: Eunice, New Mexico