Hardness
Moderately Hard
90.5 PPM · 5.3 GPG
Local water dashboard
Official source aggregationWater quality in Los Ojos, NM 87551
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Rio Arriba County.
2 active health-based violations
- Primary matched system
- Los Ojos Mdwca
- Source water
- Groundwater + Groundwater influenced by surface water
- County
- Rio Arriba County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
2 active health-based records
Lead 90th percentile
0.016 mg/L
107% of action level
Utility match
3 systems
Serves 237 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
90.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
90.5
mg/L as CaCO₃ equivalent
Grains per gallon
5.3
1 GPG ≈ 17.1 PPM
What this means at home
At 90.5 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
12
Nearest site
14 mi
Observation range
Oct 25, 2016–Aug 4, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 27N.04E.13.411A (Well).USGS source documentation ↗
Regional context
Is 87551 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Los Ojos median
91 PPM
About the same1 indexed ZIP readings · Range 90.5–90.5 PPM
New Mexico median
228 PPM
137 PPM lower194 indexed ZIP readings · Range 74.2–688.5 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
0 pass2 fail
Lead (PB90)
0.016 mg/L
Reported Dec 31, 2027
Copper (CU90)
2.3 mg/L
Reported Dec 31, 2027
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.016
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 2.3
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 57
- Health-based
- 15
- Active health-based
- 2
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | NM3566221 | Unaddressed | Feb 28, 2026 |
| Consumer Confidence Rule | NM3502221 | Unaddressed | Oct 1, 2025 |
| Public Notice | NM3502921 | Unaddressed | Aug 20, 2025 |
| Surface Water Treatment Rule | NM3502221 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | NM3502221 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| Consumer Confidence Rule | NM3502221 | Resolved | Jul 1, 2025through Jan 26, 2026 |
| Lead and Copper Rule | NM3566221 | Resolved | Jul 1, 2025through Dec 9, 2025 |
| Public Notice | NM3502221 | Unaddressed | Jun 15, 2025 |
| Interim Enhanced Surface Water Treatment Rule | NM3502221 | Resolved | May 1, 2025through May 31, 2025 |
| Surface Water Treatment Rule | NM3502221 | Resolved | May 1, 2025through May 31, 2025 |
| Public Notice | NM3502221 | Unaddressed | Feb 21, 2025 |
| LEAD AND COPPER RULE REVISIONS | NM3502921 | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | NM3502921 | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | NM3502221 | Addressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | NM3502221 | Addressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | NM3566221 | Resolved | Oct 17, 2024through Aug 15, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | NM3566221 | Resolved | Oct 17, 2024through Aug 15, 2025 |
| Consumer Confidence Rule | NM3502921 | Resolved | Oct 1, 2024through Dec 18, 2024 |
| Consumer Confidence Rule | NM3502221 | Unaddressed | Oct 1, 2024 |
| Lead and Copper Rule | NM3566221 | Resolved | Oct 1, 2024through Dec 9, 2025 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Los Ojos ZIP 87551 using 90.5 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Lead (90th percentile), Copper (90th percentile), LEAD AND COPPER RULE REVISIONS have a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Los Ojos
Is tap water safe in Los Ojos?+
EPA ECHO reports 2 active health-based violations among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 90.5 PPM, or 5.3 grains per gallon, classified as moderately hard. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.