We read 17 results from Arrow Rock Pws’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 235 people · Water system ID MO2010029 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
Results from the 2025 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 1.65 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal8.2x the health goal |
| Aluminumhighest measured · range 0.01 to 0.01 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 0.01 ppm | — | 0.2 ppm guideline | Within the guideline |
| Chloridehighest measured · range 25 to 25 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 25 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 14.3 to 22.3 · Purchased water: Distribution system, highest of 4 sources · 2025 report, page 3 | 26 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 47.9 to 72 · Purchased water: Distribution system, highest of 2 sources · 2025 report, page 3 | 76 ppb | None set | 80 ppb | Below the legal limit |
| Ironhighest measured · range 0.05 to 0.05 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 0.05 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.0013 to 0.0013 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 0.0013 ppm | — | 0.05 ppm guideline | Within the guideline |
| pHhighest measured · range 7.9 to 7.9 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 7.9 | — | — | Normal range |
| Sulfatehighest measured · range 12.6 to 12.6 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 12.6 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 118 to 118 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 118 ppm | — | 500 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 146 to 146 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 146 ppm | None set | None | No health limit |
| Calciumhighest measured · range 11.4 to 11.4 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 11.4 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 3.16 to 3.16 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 3.16 gpg (54 ppm) | — | — | Soft |
| Magnesiumhighest measured · range 6.2 to 6.2 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 6.2 ppm | None set | None | No health limit |
| Potassiumhighest measured · range 4.93 to 4.93 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 4.93 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 14.1 to 14.1 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 14.1 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. 6 numbers we weren’t sure about are held back until a person checks.
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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
More districts: Missouri water quality · All states · Something look wrong? Tell us