We read 31 results from Montebello Land & Water Co.’s 2024 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 26,554 people · Water system ID CA1910091 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenicaverage · range ND to 2.2 · Groundwater · 2024 report, page 4 | 2 ppb | 0.004 ppb | 10 ppb | Above the health goal500x the health goal |
| Chromium-6average · range ND to 0.55 · Groundwater · 2024 report, page 4 | 0.33 ppb | 0.02 ppb | 10 ppb | Above the health goal17x the health goal |
| PFOA (a PFAS)average · range 4 to 22 · Groundwater · 2024 report, page 4 | 20 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20295x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOS (a PFAS)average · range 35 to 67 · Groundwater · 2024 report, page 4 | 60 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 202915x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Uraniumaverage · range ND to 2.38 · printed as 1 pCi/L · sampled 2023 · Groundwater · 2024 report, page 4 | 1.49 ppb | 0.6 ppb | 30 ppb | Above the health goal2.5x the health goal |
| Chlorideaverage · range 48 to 70 · Groundwater · 2024 report, page 4 | 58 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.3 to 1.2 · Distribution system · 2024 report, page 4 | 0.64 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)average · range ND to 3.3 · Distribution system · 2024 report, page 4 | 3.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 5.1 to 21 · Distribution system · 2024 report, page 4 | 19 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.18 to 0.35 · Groundwater · 2024 report, page 4 | 0.31 ppm | 1 ppm | 2 ppm | Below the health goal |
| Ironaverage · range ND to 0.32 · printed as 81 ppb · Groundwater · 2024 report, page 4 | 0.08 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2024 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Manganeseaverage · range ND to 0.04 · printed as 9.3 ppb · Groundwater · 2024 report, page 4 | 0.0093 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)average · range ND to 4 · Groundwater · 2024 report, page 4 | 2.2 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)average · range 5 to 8.4 · Groundwater · 2024 report, page 4 | 6.4 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| pHaverage · range 7.5 to 7.9 · Groundwater · 2024 report, page 4 | 7.7 | — | — | Normal range |
| Sulfateaverage · range 72 to 110 · Groundwater · 2024 report, page 4 | 84 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 350 to 480 · Groundwater · 2024 report, page 4 | 390 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)average · range 0.1 to 1.7 · Groundwater · 2024 report, page 4 | 0.5 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 170 to 210 · Groundwater · 2024 report, page 4 | 180 ppm | None set | None | No health limit |
| Calciumaverage · range 57 to 79 · Groundwater · 2024 report, page 4 | 66 ppm | None set | None | No health limit |
| Conductivityaverage · range 630 to 770 · Groundwater · 2024 report, page 4 | 700 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 10.5 to 15.2 · Groundwater · 2024 report, page 4 | 12.3 gpg (210 ppm) | — | — | Very hard |
| Magnesiumaverage · range 9.5 to 16 · Groundwater · 2024 report, page 4 | 12 ppm | None set | None | No health limit |
| PFBA (a PFAS)average · range 5 to 17 · Groundwater · 2024 report, page 4 | 12 ppt | None set | None | No health limit |
| PFBS (a PFAS)average · range 3.5 to 13 · Groundwater · 2024 report, page 4 | 9.7 ppt | None set | None | No health limit |
| PFHpA (a PFAS)average · range ND to 6.8 · Groundwater · 2024 report, page 4 | 3.8 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 13 · Groundwater · 2024 report, page 4 | 6.6 ppt | None set | None | No health limit |
| PFPeA (a PFAS)average · range ND to 14 · Groundwater · 2024 report, page 4 | 6.9 ppt | None set | None | No health limit |
| Potassiumaverage · range 3.3 to 4.4 · Groundwater · 2024 report, page 4 | 3.9 ppm | None set | None | No health limit |
| Sodiumaverage · range 46 to 56 · Groundwater · 2024 report, page 4 | 51 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Montebello Land & Water Co.’s water between Aug 2023 and Oct 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA16 pptFound in 4 of 6 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS53 pptFound in 6 of 6 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS8.6 pptFound in 6 of 6 samples · highest resultNo federal limit in force for this one
- PFBS11 pptFound in 6 of 6 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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