Hardness
Very hard source averages235–316mg/L as CaCO₃
Range of three source averages
USGS: very hard >180 mg/L
Full range: 162–431 mg/L. Source averages ≈ 13.7–18.5 gpg.
2025
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Your local water, explained
Anaheim water quality report
Very hard source averages, chlorine disinfection and a byproduct result close to its limit.
Anaheim’s 2026 report contains 2025 data. It supports a softener recommendation for scale, while its TTHM result and monitoring notice deserve their own context.
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Your water
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These are utility measurements, not a test at your tap or a current service advisory. Sources checked October 25, 2026
Showing utility report
Anaheim Public Utilities
2025 utility report; each result retains its sampling year
Only use these results if Anaheim Public Utilities is the supplier on your bill. Other utilities and private wells need their own data.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Disinfectant residual
Below 4 mg/L MRDL1.1mg/L
Chlorine · reported average
Reported range: ND–3.9 mg/L.
2025
View source ↗TTHM
Close to 80 ppb MCL77ppb
Highest locational running annual average
Below the limit. A single-sample maximum of 93 ppb is not the annual-average compliance result.
2025
View source ↗HAA5
Below 60 ppb MCL13ppb
Highest locational running annual average
See the missed-sample notice above.
2025
View source ↗Fluoride
Below California 2 mg/L MCL0.3–0.7mg/L
Range of source averages · full range 0.3–0.8
2025
View source ↗Lead
Below 15 ppb action levelND (<5)ppb
90th percentile · 51 sampled taps
0 of 51 sites exceeded the action level. ND is not zero.
2025
View source ↗Arsenic
Below 10 ppb MCLND–2.1ppb
Range of source averages · full range ND–2.5
Different from California’s 0.004 ppb health goal.
2025
View source ↗PFAS
Review compound-specific resultsDetected
Multiple compounds in source-column results
These are not individual home measurements. See PFOS/PFOA and other compounds below.
2025
View source ↗View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
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| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 235–316 mg/L as CaCO₃Range of three source averages | 2025View source ↗ | Very hard source averagesFull range: 162–431 mg/L. Source averages ≈ 13.7–18.5 gpg. |
| Disinfectant residual | 1.1 mg/LChlorine · reported average | 2025View source ↗ | Below 4 mg/L MRDLReported range: ND–3.9 mg/L. |
| TTHM | 77 ppbHighest locational running annual average | 2025View source ↗ | Close to 80 ppb MCLBelow the limit. A single-sample maximum of 93 ppb is not the annual-average compliance result. |
| HAA5 | 13 ppbHighest locational running annual average | 2025View source ↗ | Below 60 ppb MCLSee the missed-sample notice above. |
| Fluoride | 0.3–0.7 mg/LRange of source averages · full range 0.3–0.8 | 2025View source ↗ | Below California 2 mg/L MCL |
| Lead | ND (<5) ppb90th percentile · 51 sampled taps | 2025View source ↗ | Below 15 ppb action level0 of 51 sites exceeded the action level. ND is not zero. |
| Arsenic | ND–2.1 ppbRange of source averages · full range ND–2.5 | 2025View source ↗ | Below 10 ppb MCLDifferent from California’s 0.004 ppb health goal. |
| PFAS | Detected Multiple compounds in source-column results | 2025View source ↗ | Review compound-specific resultsThese are not individual home measurements. See PFOS/PFOA and other compounds below. |
| Nitrate as nitrogen | 2.6 / ND / ND mg/L as NGroundwater / Lenain / MWD averages · range ND–5.1 | 2025View source ↗ | Below 10 mg/L MCL |
| Copper | 0.1 mg/L90th percentile · 51 sampled taps | 2025View source ↗ | Below 1.3 mg/L action level |
| Total dissolved solids | 557 / 640 / 541 mg/LGroundwater / Lenain / MWD averages | 2025View source ↗ | Below 1,000 mg/L secondary MCLFull range: 338–784 mg/L. This is an aesthetic benchmark. |
| Hardness — Groundwater | 316 mg/L as CaCO₃Source average | 2025View source ↗ | Very hardCalculated average: 18.5 gpg. |
| Hardness — Lenain | 298 mg/L as CaCO₃Source average | 2025View source ↗ | Very hardCalculated average: 17.4 gpg. |
| Hardness — MWD | 235 mg/L as CaCO₃Source average | 2025View source ↗ | Very hardCalculated average: 13.7 gpg. |
| PFOS | 4.1 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–29 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFOA | 2.3 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–10 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFHxS | 2.1 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–13 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFBS | ND / ND / ND pptGroundwater / Lenain / MWD averages · range ND–3.4 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFBA | 4.9 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–17 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFHxA | 1.2 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–8.8 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
| PFPeA | 4.6 / ND / ND pptGroundwater / Lenain / MWD averages · range ND–13 | 2025View source ↗ | Detection reportedSource-column results. Report notification/response levels are not federal MCLs; these values do not establish a present compliance finding. |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A PHG is a health goal, not the legal limit. Lead/copper action levels use system sampling percentiles, not a safe-tap threshold. TTHM/HAA5 comparisons use locational running annual averages.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. Notification and response levels in a utility report are not maximum contaminant levels; do not infer a compliance violation from a single value. EPA PFAS benchmarks and implementation ↗
Turn your report into a plan for your home.
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Source water. Orange County groundwater plus imported Northern California and Colorado River water. Lenain treats imported supplies; these source columns describe different water blends.
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
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More about your local water
What this means for your home
Orange County Water District supplies regional groundwater management, but retail utilities issue their own customer reports. Match the retail supplier on your bill before using Anaheim’s figures.
A useful local question
Does a 93 ppb TTHM sample mean Anaheim violated the limit?
Not by itself. The 80 ppb limit is assessed using locational running annual averages. Anaheim reports a highest LRAA of 77 ppb and separately discloses a missed HAA monitoring sample.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
- Anaheim Public Utilities ↗2025 utility report; each result retains its sampling year
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 25, 2026
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